CVE-2024-35228: Improper Handling of Insufficient Permissions in `wagtail.contrib.settings`

Due to an improperly applied permission check in the wagtail.contrib.settings module, a user with access to the Wagtail admin and knowledge of the URL of the edit view for a settings model can access and update that setting, even when they have not been granted permission over the model. The vulnerability is not exploitable by an ordinary site visitor without access to the Wagtail admin.