🐛 Fix MKS Robin E3/E3D Z Stop/Probe pins (#23034)

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_E3_common.h

@@ -54,8 +54,14 @@
 //
 #define X_STOP_PIN                          PA12
 #define Y_STOP_PIN                          PA11
-#define Z_MIN_PIN                           PC6
-#define Z_MAX_PIN                           PB1
+#define Z_STOP_PIN                          PC6
+
+//
+// Z Probe
+//
+#ifndef Z_MIN_PROBE_PIN
+  #define Z_MIN_PROBE_PIN                   PB1
+#endif
 
 //
 // Steppers