e mixer fix - fix default mixer to pulse if there
e mixer fix - fix default mixer to pulse if there

this makes e use the correct mixer backend if pulse is available as
opposed to using alsa going behind pulses back.

@fix

tizenorg/platform.upstream.enlightenment,tasn/enlightenment,rvandegrift/e,tizenorg/platform.upstream.enlightenment,rvandegrift/e,rvandegrift/e,tasn/enlightenment,tizenorg/platform.upstream.enlightenment,tasn/enlightenment