Add missing use statements in modules classes

src/Module/Delegation.php

@@ -24,6 +24,7 @@ namespace Friendica\Module;
 use Friendica\BaseModule;
 use Friendica\Core\Hook;
 use Friendica\Core\Renderer;
+use Friendica\Core\Session;
 use Friendica\Database\DBA;
 use Friendica\DI;
 use Friendica\Model\Notification;