play dial tones on STREAM_MUSIC when phone is silent

when the phone is silent only the first ~three tones are played when
attempting to play out the tone over STREAM_VOICE_CALL

it’s unclear exactly why this is the case (in the past we went back and forth
between STREAM_VOICE_CALL and STREAM_MUSIC) exactly to fix issues around silent
mode.
Apparently we failed to test this past three sounds.

This commit changes the stream back to music - but not generally as this was in
the past - but only for when the phone is on silent