Add another work sounds test

This was removed when fixing the 4 broken tests. Here it is again to get
the coverage back to where it was, using mAudioHelper to get the profile
unlocked state this time instead of UserManager directly (where this is
a hidden API, so not something robolectric supports)

Test: make RunSettingsRoboTests
Change-Id: I8bd383ea8a899004a6208968911d60df9b3b17bc