Move above application windows to APPLICATION_LAYER + 1

Before, some windows of types that were assigned to the
APPLICATION_LAYER. When those windows were added to the DA hierarchy,
they were added to APPLICATION_LAYER + 1. Now, we assign them to
APPLICATION_LAYER + 1 to match the hierarchy.

Bug: 157683117
Test: go/wm-smoke
Change-Id: I67689f3d9b42d4093333767813f133515e5756ee