Enable contrast via LCD_CONTRAST_INIT (#15006)

Marlin/src/module/configuration_store.cpp

@@ -828,8 +828,10 @@ void MarlinSettings::postprocess() {
       const int16_t lcd_contrast =
         #if HAS_LCD_CONTRAST
           ui.contrast
+        #elif defined(DEFAULT_LCD_CONTRAST)
+          DEFAULT_LCD_CONTRAST
         #else
-          32
+          127
         #endif
       ;
       EEPROM_WRITE(lcd_contrast);