Fix RemoteTransitionTest

This test use FLAG_FIRST_CUSTOM which just same as
FLAG_IS_DIVIDER_BAR, and we did some special hanlde for divider.
Change test to using FLAG_IS_DIVIDER_BAR for readability and also
fix test assertion.

Fix: 280796126
Test: atest RemoteTransitionTest
Change-Id: I969947b4a2738a0760ccef2658ecd495e57edf54
2 files changed