fix sf4 error with PickPersonType (error in commit a92686d1)

Widget/PersonListWidget.php

@@ -41,6 +41,12 @@ use Chill\CustomFieldsBundle\Entity\CustomField;
  */
 class PersonListWidget implements WidgetInterface
 {
+    /**
+     * Repository for persons
+     *
+     * @var EntityRepository
+     */
+    protected $personRepository;
     
     /**
      * The entity manager
@@ -69,6 +75,7 @@ class PersonListWidget implements WidgetInterface
     protected $user;
     
     public function __construct(
+            EntityRepository $personRepostory,
             EntityManager $em,
             AuthorizationHelper $authorizationHelper,
             TokenStorage $tokenStorage