fix(settings): Put Users delegated settings back into admindelegation section

Signed-off-by: Côme Chilliet <come.chilliet@nextcloud.com>

apps/settings/lib/Settings/Admin/Users.php

@@ -37,7 +37,7 @@ class Users implements IDelegatedSettings {
 	}
 
 	public function getSection(): ?string {
-		return null;
+		return 'admindelegation';
 	}
 
 	/**