Bootscreen parity with 1.1.x

Marlin/src/lcd/ultralcd_impl_HD44780.h

   }
 
   void lcd_bootscreen() {
-    const static PROGMEM byte corner[4][8] = { {
+    lcd_set_custom_characters(CHARSET_BOOT);
-      B00000,
-      B00000,
-      B00000,
-      B00000,
-      B00001,
-      B00010,
-      B00100,
-      B00100
-    }, {
-      B00000,
-      B00000,
-      B00000,
-      B11100,
-      B11100,
-      B01100,
-      B00100,
-      B00100
-    }, {
-      B00100,
-      B00010,
-      B00001,
-      B00000,
-      B00000,
-      B00000,
-      B00000,
-      B00000
-    }, {
-      B00100,
-      B01000,
-      B10000,
-      B00000,
-      B00000,
-      B00000,
-      B00000,
-      B00000
-    } };
-    for (uint8_t i = 0; i < 4; i++)
-      createChar_P(i, corner[i]);
-
     lcd.clear();
 
     #define LCD_EXTRA_SPACE (LCD_WIDTH-8)
     #endif
 
     lcd.clear();
-
     safe_delay(100);
-
+    lcd_set_custom_characters();
-    lcd_set_custom_characters(
+    lcd.clear();
-      #if ENABLED(LCD_PROGRESS_BAR)
-        false
-      #endif
-    );
   }
 
 #endif // SHOW_BOOTSCREEN