Fix for testDisplayEvents CTS

Launching another activity instead of home to bring other activity in
cache state.

In car Ui Portrait, home is always visible, so launching the home activity doesn't have intended behavior in bringing other activities to cache state.

Bug: 300049979
Test: atest CtsDisplayTestCases:android.display.cts.DisplayEventTest#testDisplayEvents
Change-Id: I0cb11d9f111972708f7d925ddf3e49315c2ad617
3 files changed