Revert "Bug 946556 - [Music] Disable the play controls when using a bluetooth headset in a call"

This reverts commit a69025bfe657a07cca372369e0d4b83a442fba73.
Merge pull request #16020 from dominickuo/revert-bug-946556

Revert "Bug 946556 - [Music] Disable the play controls when using a bluetooth headset in a call