Replace @RequireAdbOverWifi with @UntetheredTest

An @UntetheredTest can be run in one of three ways:

1) Connected via ADB-over-USB using Tradefed - this will result in the
   test failing with an appropriate message.
2) Connected via ADB-over-USB using btest - this will prompt the tester
   to unplug and plug in the device as needed. This is the
   recommendation while developing untethered tests.
3) Connected via ADB-over-wifi using anything - this will not prompt for
   anything as the device is untethered by default.

Change-Id: Ia6031eb15debed0a28854676cb6cb7b8995ad66c
Bug: 309139194