Autocompleting POI address not working for non-staff users

[timobrembeck]

Describe the Bug

At the moment, the auto completion feature introduced in #1744 does only work for staff users.

Steps to Reproduce

1. Login as non staff user
2. Try to autocomplete POI address
3. See error in JS and Django console

Expected Behavior

The address completion should also work for non staff users.
To solve this, the region_slug parameter needs to be passed to the view, even if it's unused.
(Because our access control treats all views without the region_slug parameter as "staff area" and denies region users to access them.)

Actual Behavior

A PermissionDenied error occurs

Additional Information

At least the error is not caught in the JS code, so there is no error message shown to users, but the feature just doesn't work.

Traceback

Oct 18 06:50:51 WARNING django.request - 403 Forbidden (Permission denied): /ajax/locations/auto-complete-address/
Traceback (most recent call last):
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
  response = get_response(request)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/integreat_cms/core/middleware/access_control_middleware.py", line 67, in __call__
  raise PermissionDenied(
django.core.exceptions.PermissionDenied: <SimpleLazyObject: <User (id: 930, username: maucher, role: Management, region: lkmuenchen)>> does not have the permission to access the staff area
Oct 18 06:50:54 WARNING django.request - 403 Forbidden (Permission denied): /ajax/locations/auto-complete-address/
Traceback (most recent call last):
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
  response = get_response(request)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/integreat_cms/core/middleware/access_control_middleware.py", line 67, in __call__
  raise PermissionDenied(
django.core.exceptions.PermissionDenied: <SimpleLazyObject: <User (id: 930, username: maucher, role: Management, region: lkmuenchen)>> does not have the permission to access the staff area
Oct 18 06:58:34 WARNING django.request - 403 Forbidden (Permission denied): /ajax/locations/auto-complete-address/
Traceback (most recent call last):
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
  response = get_response(request)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/integreat_cms/core/middleware/access_control_middleware.py", line 67, in __call__
  raise PermissionDenied(
django.core.exceptions.PermissionDenied: <SimpleLazyObject: <User (id: 930, username: maucher, role: Management, region: lkmuenchen)>> does not have the permission to access the staff area
Oct 18 06:58:35 WARNING django.request - 403 Forbidden (Permission denied): /ajax/locations/auto-complete-address/
Traceback (most recent call last):
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/django/core/handlers/exception.py", line 47, in inner
  response = get_response(request)
File "/opt/integreat-cms/.venv/lib/python3.9/site-packages/integreat_cms/core/middleware/access_control_middleware.py", line 67, in __call__
  raise PermissionDenied(
django.core.exceptions.PermissionDenied: <SimpleLazyObject: <User (id: 930, username: maucher, role: Management, region: lkmuenchen)>> does not have the permission to access the staff area