remove ursa. resolves #1658.

Couldn't figure out the scrim, as the callback path for this particular operation is somewhat tortured:

https://github.com/xtuple/xtuple/blob/faacbfa3a7b8b7595592e91fb72620f6a4b32c65/enyo-client/extensions/source/oauth2/client/models/oauth2.js#L85-L91

So I just added a few sentences to the notify popup.