Turn off animations in the status bar.

They're causing a number of unpleasant effects (see bug list
below). The root cause is a limitation of layout transitions
(http://b/3503912) that we don't have time to fix right now.

Bug: 3427414
Bug: 3489129
Bug: 3501979
Change-Id: Ie817b396f89847b105ef7b7c7007c7a1e64b8469