Revert "Use splitscreen insets for multiwindow, else use thumbnail insets"

This reverts commit c093b25c759ecb6f72a9f73ebfa56882d04578a6.

Reason for revert: seems the flake isn't flaking after this change

Change-Id: I03c003103b610fcdd174fbf820c428d337d9109b
2 files changed