Don't show the user aspect ratio button for transparent activities

If a permission dialog is showing, don't show the user aspect ratio
button as clicking it will take you to the app info page of the
permission dialog and not of the underlying app.

Fix: 296158940
Test: atest WmTests:TaskTests#testTopActivityEligibleForUserAspectRatioButton
Change-Id: Iceb98639de81f043c418d825cf4a270d23d1e801