Ignore virtual presentation windows - RESTRICT AUTOMERGE

Windows of TYPE_PRESENTATION on virtual displays should not be counted
as visible windows to determine if BAL is allowed.

Test: manual test, atest BackgroundActivityLaunchTest
Bug: 264029851, 205130886
Merged-In: I08b16ba1c155e951286ddc22019180cbd6334dfa
Change-Id: I08b16ba1c155e951286ddc22019180cbd6334dfa