Don't assert safe homing for delta/scara

Marlin/src/inc/SanityCheck.h

     #error "Z_PROBE_LOW_POINT must be less than or equal to 0."
   #endif
 
-  #if HOMING_Z_WITH_PROBE && DISABLED(Z_SAFE_HOMING)
+  #if HOMING_Z_WITH_PROBE && IS_CARTESIAN && DISABLED(Z_SAFE_HOMING)
     #error "Z_SAFE_HOMING is recommended when homing with a probe. Enable it or comment out this line to continue."
   #endif