Fix #2443881 (Don't display User name field for EAS account)

* Make the field and label GONE for EAS accounts
* Enable the "Done" button at all times for EAS accounts
* Add test case for this, and clean up bad formatting in tests

Bug: 2443881
Change-Id: Ic80b001e443fa37b7cfeb810b1f31edf22b065b9
3 files changed