IBX-5024: Fixed CSRF source for UserSession response in /user/session/check endpoint

Author: Steveb-p

src/lib/Server/Controller/SessionController.php

@@ -160,7 +160,7 @@ public function checkSessionAction(Request $request)
             $currentUser,
             $session->getName(),
             $session->getId(),
-            $request->headers->get('X-CSRF-Token'),
+            $this->getCsrfToken(),
             false
         );
     }