Fix Z_MIN_PROBE_PIN on SKR 1.4 (#17187)

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h

 // Z Probe (when not Z_MIN_PIN)
 //
 #ifndef Z_MIN_PROBE_PIN
-  #if Z_STOP_PIN != P1_27
-    #define Z_MIN_PROBE_PIN P1_27
-  #else
-    #define Z_MIN_PROBE_PIN P0_10
-  #endif
+  #define Z_MIN_PROBE_PIN  P0_10
 #endif
 
 //