Fix testRelaunchConfigurationChangedWhileBecomingVisible flakiness

The #getOccludingActivityAbove should stop searching occluding
once reached the given boundary. It didn't stop searching due
to the given activity was a translucent activity.


Bug: 195493245
Test: atest ActivityLifecycleTests
Change-Id: Idb16a5477650ba1113be0c07a98c40933a256ebc