Patch conditionals for DEFAULT_LCD_CONTRAST, MINIPANEL

- `DEFAULT_LCD_CONTRAST` was incorrectly overriding all `DOGLCD`
- `MINIPANEL` conditionals are identical to `MAKRPANEL`

Marlin/Conditionals.h

 
   #define LCD_HAS_DIRECTIONAL_BUTTONS (BUTTON_EXISTS(UP) || BUTTON_EXISTS(DWN) || BUTTON_EXISTS(LFT) || BUTTON_EXISTS(RT))
 
-  #if ENABLED(MAKRPANEL)
+  #if ENABLED(MAKRPANEL) || ENABLED(MINIPANEL)
     #define DOGLCD
-    #define DEFAULT_LCD_CONTRAST 17
     #define ULTIPANEL
     #define NEWPANEL
+    #define DEFAULT_LCD_CONTRAST 17
   #endif
 
   #if ENABLED(miniVIKI) || ENABLED(VIKI2) || ENABLED(ELB_FULL_GRAPHIC_CONTROLLER)
     #define NEWPANEL
   #endif
 
-  #if ENABLED(MINIPANEL)
-    #define DOGLCD
-    #define ULTIPANEL
-    #define NEWPANEL
-    #define DEFAULT_LCD_CONTRAST 17
-  #endif
-
   /**
    * I2C PANELS
    */
   /**
    * Default LCD contrast for dogm-like LCD displays
    */
-  #if ENABLED(DOGLCD) && DISABLED(DEFAULT_LCD_CONTRAST)
-    #define DEFAULT_LCD_CONTRAST 32
-  #endif
-
   #if ENABLED(DOGLCD)
+    #if !defined(DEFAULT_LCD_CONTRAST)
+      #define DEFAULT_LCD_CONTRAST 32
+    #endif
     #define HAS_LCD_CONTRAST
     #if ENABLED(U8GLIB_ST7920)
       #undef HAS_LCD_CONTRAST