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
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:07019d9060d31d12b1d2cbb10635dfaa1b36c95c)
Merged-In: I0f6bc691ca50582cb56e3b8a7ade14eac1660358
Change-Id: I0f6bc691ca50582cb56e3b8a7ade14eac1660358