Made #ifdef DELTA branch instead

Another fellow here gave me the idea to do it this way

Marlin/pins_AZTEEG_X3_PRO.h

@@ -16,23 +16,23 @@
 //
 //This section is to swap the MIN and MAX pins because the X3 Pro comes with only
 //MIN endstops soldered onto the board. Delta code wants the homing endstops to be 
-//the MAX so I swapped them here. Comment them out with // if you want them original.
-//Note: I had to solder on the additional MAX Endstop pins to attach a Z-Probe 
-//endstop switch.
+//the MAX so I swapped them here.
 //
-//#undef X_MIN_PIN
-//#undef X_MAX_PIN
-//#undef Y_MIN_PIN
-//#undef Y_MAX_PIN
-//#undef Z_MIN_PIN
-//#undef Z_MAX_PIN
-
-//#define X_MIN_PIN           2
-//#define X_MAX_PIN           3
-//#define Y_MIN_PIN          15
-//#define Y_MAX_PIN          14
-//#define Z_MIN_PIN          19
-//#define Z_MAX_PIN          18
+ #ifdef DELTA
+  #undef X_MIN_PIN
+  #undef X_MAX_PIN
+  #undef Y_MIN_PIN
+  #undef Y_MAX_PIN
+  #undef Z_MIN_PIN
+  #undef Z_MAX_PIN
+
+  #define X_MIN_PIN           2
+  #define X_MAX_PIN           3
+  #define Y_MIN_PIN          15
+  #define Y_MAX_PIN          14
+  #define Z_MIN_PIN          19
+  #define Z_MAX_PIN          18
+ #endif
 //
 
 #define E2_STEP_PIN        23