Fix tags count in menu

Move enable cache for Tag in the Entity because function `find*` should return result and not a Query

src/Wallabag/ApiBundle/Controller/WallabagRestController.php

@@ -322,9 +322,7 @@ class WallabagRestController extends FOSRestController
 
         $tags = $this->getDoctrine()
             ->getRepository('WallabagCoreBundle:Tag')
-            ->findAllTags($this->getUser()->getId())
-            ->getQuery()
-            ->getResult();
+            ->findAllTagsWithEntries($this->getUser()->getId());
 
         $json = $this->get('serializer')->serialize($tags, 'json');