fix changed-behaviour in check mode (to not always return True) (#37776)

lib/ansible/modules/identity/keycloak/keycloak_client.py

@@ -800,6 +800,7 @@ def main():
                 if module._diff:
                     result['diff'] = dict(before=sanitize_cr(before_client),
                                           after=sanitize_cr(updated_client))
+                result['changed'] = (before_client != updated_client)
 
                 module.exit_json(**result)