DO NOT MERGE - Exclude TYPE_PRIVATE_PRESENTATION app visiblity

These windows can only be placed on private virtual displays, and as
such they should not be considered when deciding if an application has
any visible windows or not.

Bug:205130886
Test:Manually verified that sample from 205130886 no longer allows
background activity launches
Test: atest CtsActivityManagerBackgroundActivityTestCases

Change-Id: I76208722bbb7a407ba1f2dc4305a28226166414d
Merged-In: I76208722bbb7a407ba1f2dc4305a28226166414d