Assert that XY probe offsets are integers

Marlin/src/inc/SanityCheck.h

@@ -823,6 +823,9 @@ static_assert(X_MAX_LENGTH >= X_BED_SIZE && Y_MAX_LENGTH >= Y_BED_SIZE,
     #error "Z_PROBE_LOW_POINT must be less than or equal to 0."
   #endif
 
+  static_assert(int(X_PROBE_OFFSET_FROM_EXTRUDER) == (X_PROBE_OFFSET_FROM_EXTRUDER), "X_PROBE_OFFSET_FROM_EXTRUDER must be an integer value.");
+  static_assert(int(Y_PROBE_OFFSET_FROM_EXTRUDER) == (Y_PROBE_OFFSET_FROM_EXTRUDER), "Y_PROBE_OFFSET_FROM_EXTRUDER must be an integer value.");
+
 #else
 
   /**