Fix ExitPipWithDismissButtonTest#focusDoesNotChange

The transition is to click on the pip menu, then click on the dismiss
button. This will cause the focus change.

Fix: 215869110
Fix: 216306753
Test: atest WMShellFlickerTests:ExitPipWithDismissButtonTest
Change-Id: I50dab84f588c3bedaa7d65c02144054d4eefdcd5
3 files changed