LVGL followup fixing "C", etc. (#19517)

Marlin/src/lcd/extui/lib/mks_ui/draw_ui.h

  */
 #pragma once
 
-#ifdef __cplusplus
-  extern "C" { /* C-declarations for C++ */
-#endif
-
 #include <lvgl.h>
 
 #include <stdint.h>
 
 #endif // ifdef TFT35
 
+#ifdef __cplusplus
+  extern "C" { /* C-declarations for C++ */
+#endif
+
 extern char public_buf_m[100];
 extern char public_buf_l[30];
 

Marlin/src/lcd/extui/lib/mks_ui/pic_manager.h

  */
 #pragma once
 
-#include "../../../../inc/MarlinConfigPre.h"
+#include "../../../../inc/MarlinConfig.h"
 
 #include "../../../../libs/W25Qxx.h"
 

Marlin/src/lcd/extui/lib/mks_ui/tft_lvgl_configuration.cpp

       OUT_WRITE(LCD_BACKLIGHT_PIN, LOW);
       LCD_Clear(0x0000);
 
-      lcd_draw_logo();
+      TERN_(HAS_LOGO_IN_FLASH, lcd_draw_logo());
 
       OUT_WRITE(LCD_BACKLIGHT_PIN, HIGH);
       delay(2000);
   if (temp) { strcpy(temp,".GCO"); }
   sd_read_base_addr = lv_open_gcode_file((char *)name_buf);
   sd_read_addr_offset = sd_read_base_addr;
+  if (sd_read_addr_offset == 0) return LV_FS_RES_NOT_EX;
   return LV_FS_RES_OK;
 }