Set correct SelfVet ACS route

The additional SelfVet namespace was not yet reflrected in the route
(forwar) name.

This was the only occurence where the SelfVetController is called by
name. There should not be other wrong calls in the project.

See: https://www.pivotaltracker.com/story/show/187412638

src/Surfnet/StepupSelfService/SelfServiceBundle/Controller/SamlController.php

@@ -126,7 +126,7 @@ public function consumeAssertion(Request $httpRequest): Response
             $selfVetRequestId = $session->get(SelfVetController::SELF_VET_SESSION_ID);
             $secondFactorId = $selfVetRequestId->vettingSecondFactorId();
             return $this->forward(
-                'Surfnet\StepupSelfService\SelfServiceBundle\Controller\SelfVetController::consumeSelfVetAssertion',
+                'Surfnet\StepupSelfService\SelfServiceBundle\Controller\SelfVet\SelfVetConsumeController::consumeSelfVetAssertion',
                 ['secondFactorId' => $secondFactorId],
             );
         }