audioservice: re send BT_SCO parameter to HAL when audioserver restarts

Fix omission in AudioDeviceBroker.onAudioServerDied() where parameter
"BT_SCO=on|off" must be send to HAL according to current forced usage
for communication.

Bug: 135512789
Test: killaudio server during call over BT SCO
Change-Id: I1039748db5591321869f70c3dc589fbc62d41c31