REVERT: Hide the notification tray carrier label during and not after flip animation

It's possible for the user to have enough quick settings tiles to cover
the carrier label during the flip animation. This looks a bit strange,
so hide the carrier label during a flip.

Change-Id: I6dd38d5642a1d49c079ecdc4a7e904be6c26454c (reverted from commit 9ac9ee9bca477868527f1eff408e5f9a16499ea8)