fix forceReplace macro

Author: Marius

src/Providers/CrudProvider.php

@@ -42,7 +42,7 @@ function (...$arguments): Model {
         Request::macro('forceOffsetUnset', function (string $offset): Request {
             /** @var Request $this */
 
-            if ($this->json()->has($offset) > 0) {
+            if ($this->isJson()) {
                 $this->json()->remove($offset);
             }