Cleaning up bluetooth tests

Updating UserManager settings/mocking and removing unused fields.

Bug: 207175350
Fixes: 207174965
Test: atest BluetoothStateSwitchPreferenceControllerTest
Test: atest PairNewDevicePreferenceControllerUnitTest


Change-Id: I41eaf96ef34e1c81dab6f9d6b2f4965178e4a9c4
Merged-In: I41eaf96ef34e1c81dab6f9d6b2f4965178e4a9c4
(cherry picked from commit 8b05268180d13fcb28b30f4c15038d1ae193ab4a)
3 files changed