Handle cached bluetooth device with stylus pref

- Checking whether a stylus has a tail button key is not possible when
  the device is cached, so assume that it does.
- Updated StylusDevicesControllerTest to use SwitchPreferenceCompat as
  there were unrelated tests that were failing. The actual test that
  would've caught the bug only started failing after the unrelated test
  failures were fixed.

Bug: 311334474
Test: atest StylusDevicesControllerTest
Flag: N/A
Change-Id: Iee2899bf0a77a70f4a4f76833f485d511d919c40