Disable fling on layout update after programmatic shade collapse

Shade collapse triggered by three-button-nav can lead to fling expand
on the next layout change. Theoretically this could affect any shade
collapse that doesn't involve a down action on the shade.

Test: verified behavior with logging
Bug: 285798806
Change-Id: Icc044e67177767a5ef1d745d7dfbcdc81e1054ba