Fix marlinUI V2 display bootscreen reloading cached BG

Marlin/Configuration_adv.h

@@ -1398,7 +1398,7 @@
     #endif
   #endif
 
-  #if NONE(MachineCR10Orig, LowMemoryBoard, SKRMiniE3V2)
+  #if NONE(MachineCR10Orig, LowMemoryBoard, SKRMiniE3V2, MachineEnder3V2)
   // Scroll a longer status message into view
     #define STATUS_MESSAGE_SCROLLING
   #endif

Marlin/src/lcd/e3v2/marlinui/dwin_lcd.cpp

@@ -45,9 +45,9 @@ void DWIN_Startup() {
   const bool success = DWIN_Handshake();
   if (success) DEBUG_ECHOLNPGM("ok."); else DEBUG_ECHOLNPGM("error.");
   DWIN_Frame_SetDir(TERN(DWIN_MARLINUI_LANDSCAPE, 0, 1));
-  DWIN_JPG_ShowAndCache(3);
   DWIN_Frame_Clear(Color_Bg_Black); // MarlinUI handles the bootscreen so just clear here
   DWIN_UpdateLCD();
+  DWIN_JPG_ShowAndCache(3);
 }
 
 /*---------------------------------------- Picture related functions ----------------------------------------*/

Marlin/src/lcd/e3v2/marlinui/ui_common.cpp

@@ -122,6 +122,7 @@ void MarlinUI::clear_lcd() {
 
   void MarlinUI::bootscreen_completion(const millis_t sofar) {
     if ((BOOTSCREEN_TIMEOUT) > sofar) safe_delay((BOOTSCREEN_TIMEOUT) - sofar);
+    DWIN_JPG_ShowAndCache(3);
     clear_lcd();
   }