fix lcd class

Marlin/ultralcd_implementation_hitachi_HD44780.h

 #define LCD_STR_CLOCK       "\x07"
 #define LCD_STR_ARROW_RIGHT "\x7E"  /* from the default character set */
 
-LiquidCrystal lcd(LCD_PINS_RS, LCD_PINS_ENABLE, LCD_PINS_D4, LCD_PINS_D5,LCD_PINS_D6,LCD_PINS_D7);  //RS,Enable,D4,D5,D6,D7
+LCD_CLASS lcd(LCD_PINS_RS, LCD_PINS_ENABLE, LCD_PINS_D4, LCD_PINS_D5,LCD_PINS_D6,LCD_PINS_D7);  //RS,Enable,D4,D5,D6,D7
 static void lcd_implementation_init()
 {
     byte bedTemp[8] =