Fixed wrong import (#390)

Author: helios-ag

src/Controller/ElFinderController.php

@@ -7,8 +7,8 @@
 use Exception;
 use FM\ElfinderBundle\Loader\ElFinderLoader;
 use FM\ElfinderBundle\Session\ElFinderSession;
-use Psr\EventDispatcher\EventDispatcherInterface;
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
+use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\JsonResponse;
 use Symfony\Component\HttpFoundation\Request;