Automatic UI skipping not always working

[mike-marcacci]

As discovered by @clarson283 the AuthX interface does not automatically skip the authorization window in some cases where it should. In particular, she noticed that requesting the scope authx:v2.user.......{current_user_id}:r.... would cause the UI to wait for user approval before proceeding.

This may be a partial regression of #233, or an edge-case that was never covered.