Remove the extra SCO intent when changing volume

This was just a workaround until all the external parties that were
listening to the deprecated STREAM_BLUETOOTH_SCO intent adjust the code
to react to STREAM_VOICE_CALL instead.

Test: manual
Bug: 376756660
Flag: android.media.audio.deprecate_stream_bt_sco
Change-Id: I0fd11c070c45320c4ecbc3bb1c7c0a56ce439df8