Fix delete request for all entities

src/Bundle/ChillActivityBundle/Controller/ActivityController.php

@@ -99,10 +99,10 @@ final class ActivityController extends AbstractController
 
         $form = $this->createDeleteForm($activity->getId(), $person, $accompanyingPeriod);
 
-        if (Request::METHOD_DELETE === $request->getMethod()) {
+        if (Request::METHOD_POST === $request->getMethod()) {
             $form->handleRequest($request);
 
-            if ($form->isValid()) {
+            if ($form->isSubmitted() && $form->isValid()) {
                 $this->logger->notice('An activity has been removed', [
                     'by_user' => $this->getUser()->getUsername(),
                     'activity_id' => $activity->getId(),
@@ -640,7 +640,6 @@ final class ActivityController extends AbstractController
 
         return $this->createFormBuilder()
             ->setAction($this->generateUrl('chill_activity_activity_delete', $params))
-            ->setMethod('DELETE')
             ->add('submit', SubmitType::class, ['label' => 'Delete'])
             ->getForm();
     }