🐛 Fix MKS Robin E3 NeoPixel pin default (#23350)

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3_common.h

   #define Z_MIN_PROBE_PIN                   PB1
 #endif
 
-// LED driving pin
-#ifndef NEOPIXEL_PIN
-  #define NEOPIXEL_PIN                      PA2
-#endif
-
 //
 // Steppers
 //
   #endif
 #endif
 
+// LED driving pin
+#ifndef NEOPIXEL_PIN
+  #define NEOPIXEL_PIN                      PA2
+#endif
+
 //
 // SD Card
 //