Simplify old safe homing sanity check

Marlin/src/inc/SanityCheck.h

  * Make sure Z_SAFE_HOMING point is reachable
  */
 #if ENABLED(Z_SAFE_HOMING)
-  #if HAS_BED_PROBE && (ENABLED(DELTA) || IS_SCARA)
-    static_assert(WITHIN(Z_SAFE_HOMING_X_POINT, PROBE_X_MIN, PROBE_X_MAX), "Z_SAFE_HOMING_X_POINT is outside the probe region.");
-    static_assert(WITHIN(Z_SAFE_HOMING_Y_POINT, PROBE_Y_MIN, PROBE_Y_MAX), "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
+  static_assert(WITHIN(Z_SAFE_HOMING_X_POINT, X_MIN_BED, X_MAX_BED), "Z_SAFE_HOMING_X_POINT can't be reached by the nozzle.");
+  static_assert(WITHIN(Z_SAFE_HOMING_Y_POINT, Y_MIN_BED, Y_MAX_BED), "Z_SAFE_HOMING_Y_POINT can't be reached by the nozzle.");
+#endif
 
 /**
  * Make sure DISABLE_[XYZ] compatible with selected homing options