Add missing Friendica\DI namespace to files (PHPStorm inspection)

src/Module/Contact/Hovercard.php

@@ -7,6 +7,7 @@ use Friendica\Core\Config;
 use Friendica\Core\Renderer;
 use Friendica\Core\Session;
 use Friendica\Database\DBA;
+use Friendica\DI;
 use Friendica\Model\Contact;
 use Friendica\Model\GContact;
 use Friendica\Network\HTTPException;