Revert " Audio: SetForceUse config check in AudioService"

This reverts commit 0af88afe.

- During playback over BT using the Google Play Music app,
  if BT is disconnected through the app and playback is resumed,
  it continues over BT and not the speaker.
- The original commit forces playback to continue over BT
  although it is disconnected.
- Reverting the commit fixes this issue and the issue
  addressed by the commit is also not observed after reversion.

CRs-Fixed: 679301
Change-Id: Ic4d0f13615c696a12401f7a8a58651b88f31e99b