Fix compile for printer without backlight support

Firmware/ultralcd.cpp

@@ -8726,7 +8726,9 @@ uint8_t get_message_level()
 
 void menu_lcd_longpress_func(void)
 {
+#ifdef LCD_BL_PIN
 	backlightTimer_reset();
+#endif //LCD_BL_PIN
     if (homing_flag || mesh_bed_leveling_flag || menu_menu == lcd_babystep_z || menu_menu == lcd_move_z)
     {
         // disable longpress during re-entry, while homing or calibration
@@ -8838,13 +8840,17 @@ void menu_lcd_lcdupdate_func(void)
 			Sound_MakeSound(e_SOUND_TYPE_EncoderMove);
 			lcd_encoder_diff = 0;
 			lcd_timeoutToStatus.start();
+#ifdef LCD_BL_PIN
 			backlightTimer_reset();
+#endif //LCD_BL_PIN
 		}
 
 		if (LCD_CLICKED)
 		{
 			lcd_timeoutToStatus.start();
+#ifdef LCD_BL_PIN
 			backlightTimer_reset();
+#endif //LCD_BL_PIN
 		}
 
 		(*menu_menu)();