🐛 Fix Ultimain 2 E-autofan pin mapping (#23466)

Marlin/src/module/temperature.cpp

     HOTEND_LOOP() {
       if (temp_hotend[e].celsius >= EXTRUDER_AUTO_FAN_TEMPERATURE) {
         SBI(fanState, pgm_read_byte(&fanBit[e]));
-        #if MOTHERBOARD == BOARD_ULTIMAIN_2
-          // For the UM2 the head fan is connected to PJ6, which does not have an Arduino PIN definition. So use direct register access.
-          // https://github.com/Ultimaker/Ultimaker2Marlin/blob/master/Marlin/temperature.cpp#L553
-          SBI(DDRJ, 6); SBI(PORTJ, 6);
-        #endif
-      }
-      else {
-        #if MOTHERBOARD == BOARD_ULTIMAIN_2
-          SBI(DDRJ, 6); CBI(PORTJ, 6);
-        #endif
       }
     }
 

Marlin/src/pins/ramps/pins_ULTIMAIN_2.h

 #endif
 
 #ifndef E0_AUTO_FAN_PIN
-  #define E0_AUTO_FAN_PIN                     69
+  #define E0_AUTO_FAN_PIN                     77
 #endif
 
 //