[SQUASH]base: Revert secondary home handle

So following navbar mess for hours and thinking how did AOSP messed it this bad.
Apparently they draw a fake navbar for landscape orientation.
The code is broken, I don't know why or how it even got pushed.

These reverts solve "navbar" being drawn in random places on the screen
when activity resumed from recents on landscape, stealing touches while
doing nothing really.

Revert "Show secondary home handle in immersive apps"

This reverts commit 9c84ea1f.

Revert "Draw a fake home handle during QuickSwitch"

This reverts commit 63e92bc0.

Change-Id: I6223247fa2f24466f4497855f80be0faf46dd242