Have Kossel Pro use Z_MIN_PROBE_ENDSTOP (#9586)

Marlin/src/config/examples/delta/kossel_pro/Configuration.h

  *
  * Enable this option for a probe connected to the Z Min endstop pin.
  */
-#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
+//#define Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN
 
 /**
  * Z_MIN_PROBE_ENDSTOP
  * disastrous consequences. Use with caution and do your homework.
  *
  */
-//#define Z_MIN_PROBE_ENDSTOP
+#define Z_MIN_PROBE_ENDSTOP
 
 /**
  * Probe Type

Marlin/src/inc/SanityCheck.h

  * Delta requirements
  */
 #if ENABLED(DELTA)
-  #if HAS_BED_PROBE && ENABLED(Z_MIN_PROBE_ENDSTOP)
-    #error "Delta probably shouldn't use Z_MIN_PROBE_ENDSTOP. Comment out this line to continue."
-  #elif DISABLED(USE_XMAX_PLUG) && DISABLED(USE_YMAX_PLUG) && DISABLED(USE_ZMAX_PLUG)
+  #if DISABLED(USE_XMAX_PLUG) && DISABLED(USE_YMAX_PLUG) && DISABLED(USE_ZMAX_PLUG)
     #error "You probably want to use Max Endstops for DELTA!"
   #elif ENABLED(ENABLE_LEVELING_FADE_HEIGHT) && DISABLED(AUTO_BED_LEVELING_BILINEAR) && !UBL_SEGMENTED
     #error "ENABLE_LEVELING_FADE_HEIGHT on DELTA requires AUTO_BED_LEVELING_BILINEAR or AUTO_BED_LEVELING_UBL."