Error when adding InboxPermissions in a model
When I add this to the Meta of a model:
```py
permission_classes = [InboxPermissions]
```
I have an error when I access one resource (it works fine with the container)
```
TypeError at /notifications/1/
has_object_permission() missing 1 required positional argument: 'obj'
```
You can see it here: `https://test-paris.happy-dev.fr/notifications/1/`
and with the l.33 of djangoldp_notification
issue