no issue
- added actions for handling close/confirm/cancel of portal settings rather than re-using the route-level leave modal because the portal settings modal does not need any knowledge of the route
- added controller reset that is called when the route is exited to ensure no modals are shown when navigating back to the membership screen
- fixed "cannot set on destroyed" error when portal settings are opened and closed quickly
- removed usage of old `{{action}}` helper - this has been replaced with `{{on}}` and `{{fn}}`
