Allow zero Z_RAISE_BETWEEN_PROBINGS

Marlin/SanityCheck.cpp

     #error "You must set Z_RAISE_BETWEEN_PROBINGS in your configuration."
   #elif Z_RAISE_PROBE_DEPLOY_STOW < 0
     #error "Probes need Z_RAISE_PROBE_DEPLOY_STOW >= 0."
-  #elif Z_RAISE_BETWEEN_PROBINGS < 1
-    #error "Probes need Z_RAISE_BETWEEN_PROBINGS >= 1."
+  #elif Z_RAISE_BETWEEN_PROBINGS < 0
+    #error "Probes need Z_RAISE_BETWEEN_PROBINGS >= 0."
   #endif
 
 #else