Set bluetooth to turning off when toggled

This will change the state immediately to turning off, and show it as
off on the tile, giving immediate feedback.

Test: manual, toggle tile.
Test: atest BluetoothTileTest
Flag: com.android.systemui.qs_ui_refactor_compose_fragment
Bug: 396372299

Change-Id: I4d2f3f47c976a3de9b78f60cc2053e65bc8c8035