Reset the layer of the nav bar when restoring it back

We set the layer of the nav bar to MAX_VALUE when attaching the nav bar
to app during quick-step gesture.
Hence, we also need to reset it when restoring it back.

Bug: 184914153
Test: atest RecenteAnimationControlerTest
Change-Id: I331a2992c1b965503f714683f8be56d473e03434
2 files changed