Fix set_lcd_contrast

Marlin/ultralcd.cpp

@@ -4052,7 +4052,7 @@ void lcd_reset_alert_level() { lcd_status_message_level = 0; }
 
 #if HAS_LCD_CONTRAST
 
-  void set_lcd_contrast(const int value) {
+  void set_lcd_contrast(const uint16_t value) {
     lcd_contrast = constrain(value, LCD_CONTRAST_MIN, LCD_CONTRAST_MAX);
     u8g.setContrast(lcd_contrast);
   }