Revert "Revert "Enable taskbar in overview by default""

This reverts commit 6f0b0fe742663759216ddec52d6a35445d30662c.

Bug: 245320601
Reason for revert: Re-land "Enable taskbar in overview by default"

Change-Id: Ie722a608d6bd7168744ffc81c156e4307d4c1d2d
2 files changed