Add missing use statement in Search\Directory

- Fixes https://github.com/friendica/friendica/issues/7297#issuecomment-522346804

src/Module/Search/Directory.php

@@ -5,6 +5,7 @@ namespace Friendica\Module\Search;
 use Friendica\Content\Widget;
 use Friendica\Core\L10n;
 use Friendica\Module\BaseSearchModule;
+use Friendica\Module\Login;
 
 /**
  * Directory search module