Page-specific permissions cause error in page form

[timobrembeck]

Describe the Bug

When page-specific permissions are enabled in the region form, the page form throws an error

Steps to Reproduce

1. Enable page-specific permissions for a region
2. Go to a page form in this region
3. See error

Expected Behavior

The page-specific permissions should be manageable when they're activated

Actual Behavior

A NoReverseMatch error appears

Additional Information

Traceback

render
  bit = node.render_annotated(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
  return self.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 315, in render
  return nodelist.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
  bit = node.render_annotated(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
  return self.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 315, in render
  return nodelist.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
  bit = node.render_annotated(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
  return self.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/loader_tags.py", line 195, in render
  return template.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 172, in render
  return self._render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 162, in _render
  return self.nodelist.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 938, in render
  bit = node.render_annotated(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/base.py", line 905, in render_annotated
  return self.render(context)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/template/defaulttags.py", line 449, in render
  url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/urls/base.py", line 86, in reverse
  return resolver._reverse_with_prefix(view, prefix, *args, **kwargs)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/urls/resolvers.py", line 698, in _reverse_with_prefix
  raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'grant_page_permission_ajax' with no arguments not found. 1 pattern(s) tried: ['(?P<region_slug>[^/]+)/ajax/page\\-permission/grant/\\Z']