[Output Switcher] Device status is not updated when a disconnected BT

device is connected and activated

-reset currentActivePosition to refresh all devices when connected device
is changed

Bug: 190146269
Test: atest MediaOutputAdapterTest MediaOutputControllerTest MediaOutputBaseDialogTest MediaOutputDialogTest MediaOutputGroupAdapterTest MediaOutputGroupDialogTest
Change-Id: Ifac79a093abc116a12c525d77426dea290c71314