Revert changes to pins_Einsy_1_0.h not related to the fan check error

fix

Firmware/pins_Einsy_1_0.h

@@ -99,8 +99,7 @@
 
 //#define KILL_PIN            32
 
-// LCD backlight pin may interfere with something, this is yet to be found out correctly
-#define LCD_BL_PIN          5   //backlight control pin
+//#define LCD_BL_PIN          5   //backlight control pin
 #define BEEPER              84  // Beeper on AUX-4
 #define LCD_PINS_RS         82
 #define LCD_PINS_ENABLE     61 // !!! changed from 18 (EINY03)