Move braces in homeaxis to prevent a hanging else (PR#2451)

Marlin/Marlin_main.cpp

 
     #endif
 
-    #ifdef SERVO_ENDSTOPS
-      {
+    {
+      #ifdef SERVO_ENDSTOPS
         // Retract Servo endstop if enabled
         if (servo_endstops[axis] > -1)
           servo[servo_endstops[axis]].move(0, servo_endstop_angles[axis * 2 + 1]);
-      }
-    #endif
+      #endif
+    }
 
   }
 }