Fix HeadUpManagerImplTest

This test was failing when we enabled the promoted ui flag because the new behavior applies if *either* of the flags is enabled, but not both. The test wasn't updated with the implementation.

Change-Id: Idccd23f2a9c70a46c87462cd8e817e2110d3d963
Flag: com.android.systemui.status_bar_notification_chips
Flag: android.app.ui_rich_ongoing
Test: atest HeadsUpManagerImplTest
Fixes: 393592781