Bug 1108419 - Fix angular check for user email

This fixes Bugzilla bug [1108419](https://bugzilla.mozilla.org/show_bug.cgi?id=1108419).

This angular test was incorrect and causing console errors.

I've re-tested the change locally. Although I have no vagrant backend, I've faked a login by setting a user.email manually, and the user email continues to correctly appear when true, suppressed when not, and now has a clean console output.

Tested on Windows:
FF Release **33.1.1**
Chrome Latest Release **39.0.2171.71 m**

Adding @wlach for review.