Fix AssignmentPollUpdateView

CHANGELOG

@@ -16,6 +16,8 @@ Core:
 Motions:
 - New Feature to create amendments, which are related to a parent motion.
 - Added possibility to hide motions from non staff users in some states.
+Assignments:
+- Fix permissions to alter assignment polls.
 Other:
 - Cleaned up utils.views to increase performance when fetching single objects
   from the database for a view (#1378).

openslides/assignment/views.py

@@ -200,6 +200,7 @@ class PollCreateView(SingleObjectMixin, RedirectView):
 
 
 class PollUpdateView(PollFormView):
+    required_permission = 'assignment.can_manage_assignment'
     poll_class = AssignmentPoll
     template_name = 'assignment/assignmentpoll_form.html'