DX: fix phpstan issues

src/Bundle/ChillCalendarBundle/Controller/CalendarController.php

@@ -544,21 +544,6 @@ class CalendarController extends AbstractController
         return $filterOrder->build();
     }
 
-    private function buildParamsToUrl(?User $user, ?AccompanyingPeriod $accompanyingPeriod): array
-    {
-        $params = [];
-
-        if (null !== $user) {
-            $params['user_id'] = $user->getId();
-        }
-
-        if (null !== $accompanyingPeriod) {
-            $params['id'] = $accompanyingPeriod->getId();
-        }
-
-        return $params;
-    }
-
     /**
      * Creates a form to delete a Calendar entity by id.
      */