Wanhao Duplicator i3 Mini config updates (#14908)

Marlin/src/pins/mega/pins_WANHAO_ONEPLUS.h

 #define KILL_PIN           64
 
 //
-// LCD / Controller
+// LCD / Controller (Integrated MINIPANEL)
 //
-
-#if HAS_SPI_LCD
+#if ENABLED(MINIPANEL)
   #define DOGLCD_A0        40
   #define DOGLCD_CS        41
   #define LCD_BACKLIGHT_PIN 65   // Backlight LED on A11/D65
   #define LCD_RESET_PIN    27
 
-  #define LCD_CONTRAST    255
+  #define BTN_EN1           2
+  #define BTN_EN2           3
+  #define BTN_ENC           5
 
-  #if ENABLED(NEWPANEL)
-    #define BTN_EN1         2
-    #define BTN_EN2         3
-    #define BTN_ENC         5
-  #endif
+  // This display has adjustable contrast
+  #undef HAS_LCD_CONTRAST
+  #define HAS_LCD_CONTRAST 1
+  #define LCD_CONTRAST_MIN       0
+  #define LCD_CONTRAST_MAX     255
+  #define DEFAULT_LCD_CONTRAST 255
 #endif

config/examples/Wanhao/Duplicator i3 Mini/Configuration.h

  */
 
 // Enable to show the bitmap in Marlin/_Bootscreen.h on startup.
-//#define SHOW_CUSTOM_BOOTSCREEN
+#define SHOW_CUSTOM_BOOTSCREEN
 
 // Enable to show the bitmap in Marlin/_Statusscreen.h on the status screen.
 //#define CUSTOM_STATUS_SCREEN_IMAGE
 // MakerLab Mini Panel with graphic
 // controller and SD support - http://reprap.org/wiki/Mini_panel
 //
-//#define MINIPANEL
+#define MINIPANEL
 
 //
 // MaKr3d Makr-Panel with graphic controller and SD support.
 // MKS MINI12864 with graphic controller and SD support
 // https://reprap.org/wiki/MKS_MINI_12864
 //
-#define MKS_MINI_12864
+//#define MKS_MINI_12864
 
 //
 // FYSETC variant of the MINI12864 graphic controller with SD support

config/examples/Wanhao/Duplicator i3 Mini/_Bootscreen.h

+/**
+ * Made with Marlin Bitmap Converter
+ * http://marlinfw.org/tools/u8glib/converter.html
+ */
+#define CUSTOM_BOOTSCREEN_BMPWIDTH  80
+#define CUSTOM_BOOTSCREEN_Y          3
+
+const unsigned char custom_start_bmp[] PROGMEM = {
+  B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000111,B11000000,B00000000,B00000000,
+  B00000000,B00000000,B00000000,B00000000,B00110111,B00000000,B01111111,B10111100,B00000000,B00000000,
+  B00000000,B00000000,B00000000,B00000000,B11111111,B11111111,B11111111,B10111111,B10000000,B00000000,
+  B00000000,B00000000,B00000000,B00000111,B11111111,B11111111,B11111111,B01111111,B11000000,B00000000,
+  B00000000,B00000000,B00000000,B00011111,B11101111,B11111111,B11111111,B01111111,B11111111,B00000000,
+  B00000000,B00000000,B00000000,B00111111,B11101111,B11111111,B11111111,B11111111,B11111111,B11100000,
+  B00000000,B00000000,B00000000,B11111111,B11101111,B11111111,B11111111,B11111111,B11100000,B00110000,
+  B00000000,B00000000,B00000011,B11111111,B11111111,B11111111,B11111111,B11111111,B11110000,B00000000,
+  B00000000,B00000000,B00000111,B11111111,B11111111,B11111111,B11111111,B11111111,B11110000,B00000000,
+  B00000000,B00000000,B00110111,B11111111,B11111111,B11111111,B11111111,B01111111,B11110000,B00000000,
+  B00000000,B00010111,B11110111,B11111111,B11101111,B11111111,B11111111,B01111111,B11110000,B00000000,
+  B00000000,B00011111,B11110111,B11111111,B11101111,B11111111,B11111111,B01111111,B11110000,B00000000,
+  B00000000,B00001111,B11110111,B11111111,B11111111,B11111111,B11111111,B10111111,B11111000,B00000000,
+  B00000000,B00001111,B11110111,B11111111,B11110111,B11111111,B11111111,B10111111,B11111000,B00000000,
+  B00000000,B00001111,B11111111,B11111111,B11110111,B11111111,B11111111,B10111111,B11111100,B00000000,
+  B00000000,B00001111,B11111011,B11111111,B11110111,B11111111,B11111111,B10111111,B11111100,B00000000,
+  B00000000,B00001111,B11111011,B11111111,B11111111,B11111111,B11111111,B11111111,B11111100,B00000000,
+  B00000000,B10001111,B11111101,B11111111,B11111011,B11111111,B11111111,B11011111,B11111000,B00000000,
+  B00000000,B11111111,B11111100,B11111111,B11111011,B11111111,B11111111,B10111111,B11110110,B00000000,
+  B00000100,B01111111,B11111110,B11111111,B11111011,B11111111,B11111111,B00011111,B11101111,B00000000,
+  B00000110,B01111111,B11111111,B00100101,B11111011,B11111111,B11111100,B11101111,B11011111,B10000000,
+  B00000111,B11111111,B11111111,B00111110,B01110000,B11111111,B11110000,B11110011,B11011111,B11000000,
+  B00000011,B11111111,B11111100,B00111111,B10000000,B00001111,B10000000,B01111101,B10111111,B11000000,
+  B00000001,B11111111,B11111000,B00011111,B11011000,B00000000,B00000000,B11111111,B10111111,B10000000,
+  B00000001,B11111111,B11100000,B00001111,B11011111,B00000000,B00000001,B11111111,B00011111,B10000000,
+  B00000000,B01111111,B11000000,B00001111,B11111111,B10000000,B00000011,B11111110,B00011111,B00000000,
+  B00000000,B00111111,B10000000,B00001111,B10111111,B10000000,B00000011,B11111000,B00111111,B00000000,
+  B00000000,B00111111,B00000000,B00001111,B10011111,B11000000,B00000111,B11000000,B00111110,B00000000,
+  B00000000,B00011100,B00000000,B00011111,B00000000,B11000000,B00001111,B11000000,B01111110,B00000000,
+  B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
+  B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
+  B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
+  B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,B00000000,
+  B00000011,B10001100,B01110000,B11100000,B11100000,B11001100,B00011100,B00011000,B00000111,B11000000,
+  B00000011,B10011100,B01110000,B11110000,B11110001,B11001110,B00011100,B00111100,B00001111,B11100000,
+  B00000011,B10011100,B01110001,B11110000,B11110001,B11001110,B00011100,B00111100,B00011111,B11110000,
+  B00000011,B10011100,B01110001,B11110000,B11111001,B11001110,B00011100,B01111110,B00111100,B01111000,
+  B00000011,B10011100,B01110001,B11111000,B11111101,B11001111,B11111100,B01111110,B00111000,B00111000,
+  B00000001,B10011110,B11100011,B10111000,B11111111,B11001111,B11111100,B01100111,B00111000,B00011000,
+  B00000001,B11011110,B11100011,B10111000,B11101111,B11001111,B11111100,B11100111,B00111000,B00111000,
+  B00000001,B11111111,B11000011,B11111100,B11100111,B11001110,B00011100,B11111111,B00111100,B00111000,
+  B00000000,B11110111,B11000111,B11111100,B11100011,B11001110,B00011100,B11111111,B10011111,B11110000,
+  B00000000,B11110011,B10000111,B00011110,B11100011,B11001110,B00011101,B11100011,B10001111,B11110000,
+  B00000000,B01110011,B10000111,B00001110,B11100001,B11001110,B00011101,B11000011,B11000111,B11000000
+};