rdv: fix regression with multiple groups for property on calendar

src/Bundle/ChillCalendarBundle/Controller/CalendarAPIController.php

@@ -9,13 +9,25 @@ use Symfony\Component\HttpFoundation\Request;
 class CalendarAPIController extends ApiController
 {
 
+
+    protected function getContextForSerialization(string $action, Request $request, string $_format, $entity): array
+    {
+        switch($action) {
+            case '_index':
+                switch ($request->getMethod()) {
+                    case Request::METHOD_GET:
+                        return [ 'groups' => [ 'calendar:read' ] ];
+                }
+        }
+        return parent::getContextForSerialization($action, $request, $_format, $entity);
+    }
+
     protected function customizeQuery(string $action, Request $request, $qb): void
     {
         if ($request->query->has('main_user')) {
 
             $qb->where('e.mainUser = :main_user')
                ->setParameter('main_user', $request->query->get('main_user'));
-
         }
     }