Immediately enter transient enabling state in QS.

Toggling bluetooth/wifi/tethering can feel unresponsive due to the time
it takes for these services to become enabled. This change immediately
updates the QS tile UI to reflect the transient enabling state.

Fixes: 73714270
Test: visually tapping on each tile slowly and rapidly
Change-Id: Iec10054f2af4ed78e2ddc2fdcd10245a627ca50a