AudioService BtHelper: fix Bluetooth Headset to audio device mapping

Fix BtHelper.getTypeFromProfile() to return a refined audio device type
for HEADSET profile, consistent with BtHelper.getHeadsetAudioDevice()

Bug: 420508724
Test: repro steps in bug
Flag: android.media.audio.sco_managed_by_audio
Change-Id: I5847b95128cc9b31184cda0e30b35ddc1bd93383