Remove unused import

Author: Benjamin B

Controller/RegistrationController.php

@@ -24,7 +24,6 @@
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\Session\SessionInterface;
-use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
 use Symfony\Component\Security\Core\Exception\AccessDeniedException;