always completely initialize display (#9981)

Marlin/src/lcd/ultralcd_impl_HD44780.h

@@ -222,9 +222,11 @@ static void createChar_P(const char c, const byte * const ptr) {
   lcd.createChar(c, temp);
 }
 
-#define CHARSET_MENU 0
+enum HD44780CharSet : char {
-#define CHARSET_INFO 1
+  CHARSET_MENU,
-#define CHARSET_BOOT 2
+  CHARSET_INFO,
+  CHARSET_BOOT
+};
 
 static void lcd_set_custom_characters(
   #if ENABLED(LCD_PROGRESS_BAR) || ENABLED(SHOW_BOOTSCREEN)
@@ -399,16 +401,6 @@ static void lcd_set_custom_characters(
 
   #endif // SDSUPPORT
 
-  #if ENABLED(SHOW_BOOTSCREEN) || ENABLED(LCD_PROGRESS_BAR)
-    static uint8_t char_mode = CHARSET_MENU;
-    #define CHAR_COND (screen_charset != char_mode)
-  #else
-    #define CHAR_COND true
-  #endif
-
-  if (CHAR_COND) {
-    #if ENABLED(SHOW_BOOTSCREEN) || ENABLED(LCD_PROGRESS_BAR)
-      char_mode = screen_charset;
   #if ENABLED(SHOW_BOOTSCREEN)
     // Set boot screen corner characters
     if (screen_charset == CHARSET_BOOT) {
@@ -416,7 +408,6 @@ static void lcd_set_custom_characters(
         createChar_P(i, corner[i]);
     }
     else
-      #endif
   #endif
     { // Info Screen uses 5 special characters
       createChar_P(LCD_BEDTEMP_CHAR, bedTemp);
@@ -441,7 +432,7 @@ static void lcd_set_custom_characters(
           #endif
         }
     }
-  }
+
 }
 
 static void lcd_implementation_init(