Solved minor bug in controllerFan()

Extruder 2 was checked where extruder 1 should be checked.

Marlin/Marlin_main.cpp

        || !READ(E2_ENABLE_PIN)
     #endif
     #if EXTRUDER > 1
-       || !READ(E2_ENABLE_PIN)
+       || !READ(E1_ENABLE_PIN)
     #endif
        || !READ(E0_ENABLE_PIN)) //If any of the drivers are enabled...    
     {