Eleven: Bind settings fragment to music playback service

Otherwise, when toggling shake to play preference has no effect because
the service will be null in MusicUtils#setShakeToPlayEnabled(boolean).

Take one further step and store the service after connection and call
setShakeToPlayEnabled() directly instead of routing it via MusicUtils
class.

Change-Id: I0d53c2350fc0adb7ab997c8d1904f390c35d7ee8