fix: also remove use statement of UserCreatedEvent

Signed-off-by: Tobias Assmann <tobias.assmann@ecsec.de>

Author: Tobias Assmann

lib/private/Server.php

@@ -223,7 +223,6 @@
 use OCP\User\Events\PasswordUpdatedEvent;
 use OCP\User\Events\PostLoginEvent;
 use OCP\User\Events\UserChangedEvent;
-use OCP\User\Events\UserCreatedEvent;
 use OCP\User\Events\UserDeletedEvent;
 use OCP\User\Events\UserLoggedInEvent;
 use OCP\User\Events\UserLoggedInWithCookieEvent;