fix: mark groups_request_sign as not supporting user preference

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

lib/Service/Policy/Provider/RequestSignGroups/RequestSignGroupsPolicy.php

@@ -43,6 +43,7 @@ public function get(string|\BackedEnum $policyKey): IPolicyDefinition {
 					}
 				},
 				appConfigKey: self::SYSTEM_APP_CONFIG_KEY,
+				supportsUserPreference: false,
 			),
 			default => throw new \InvalidArgumentException('Unknown policy key: ' . $this->normalizePolicyKey($policyKey)),
 		};