Change which a11y services we change behavior for

Previously we were using accessibilityManager.isEnabled

The issue is that various apps include an
AccessibilityService and would trigger
isEnabled to be true when we do not want
that behavior.

Bug: 403771473
Test: atest AccessibilityRepositoryTest
Test: atest KeyguardQuickAffordanceInteractorTest
Flag: EXEMPT bugfix
Change-Id: I0e44bed843f167a402a7b3b47a3df3cde9ab0d6f