Removed FOSUser attributes removed in alpha4

See https://github.com/FriendsOfSymfony/FOSUserBundle/blob/master/Upgrade.md\#200-alpha3-to-200-alpha4

tests/Wallabag/UserBundle/Controller/ManageControllerTest.php

@@ -49,7 +49,6 @@ class ManageControllerTest extends WallabagCoreTestCase
             'user[username]' => 'test_user',
             'user[email]' => 'test@test.io',
             'user[enabled]' => true,
-            'user[locked]' => false,
         ));
 
         $client->submit($form);