Allow Z_SAFE_HOMING sanity checks to handle floats

Marlin/src/inc/SanityCheck.h

  */
 #if ENABLED(Z_SAFE_HOMING)
   #if HAS_BED_PROBE
-    #if !WITHIN(Z_SAFE_HOMING_X_POINT, MIN_PROBE_X, MAX_PROBE_X)
-      #error "Z_SAFE_HOMING_X_POINT is outside the probe region."
-    #elif !WITHIN(Z_SAFE_HOMING_Y_POINT, MIN_PROBE_Y, MAX_PROBE_Y)
-      #error "Z_SAFE_HOMING_Y_POINT is outside the probe region."
-    #endif
-  #elif !WITHIN(Z_SAFE_HOMING_X_POINT, X_MIN_POS, X_MAX_POS)
-    #error "Z_SAFE_HOMING_X_POINT can't be reached by the nozzle."
-  #elif !WITHIN(Z_SAFE_HOMING_Y_POINT, Y_MIN_POS, Y_MAX_POS)
-    #error "Z_SAFE_HOMING_Y_POINT can't be reached by the nozzle."
+    static_assert(WITHIN(Z_SAFE_HOMING_X_POINT, MIN_PROBE_X, MAX_PROBE_X),
+      "Z_SAFE_HOMING_X_POINT is outside the probe region.");
+    static_assert(WITHIN(Z_SAFE_HOMING_Y_POINT, MIN_PROBE_Y, MAX_PROBE_Y),
+      "Z_SAFE_HOMING_Y_POINT is outside the probe region.");
+  #else
+    static_assert(WITHIN(Z_SAFE_HOMING_X_POINT, X_MIN_POS, X_MAX_POS),
+      "Z_SAFE_HOMING_X_POINT can't be reached by the nozzle.");
+    static_assert(WITHIN(Z_SAFE_HOMING_Y_POINT, Y_MIN_POS, Y_MAX_POS),
+      "Z_SAFE_HOMING_Y_POINT can't be reached by the nozzle.");
   #endif
 #endif // Z_SAFE_HOMING