Improve volume sliders behaviour:

 - Add stream mute/unmute when user taps the icon
 - Snap sliders to the steps mapped to the corresponding values
 - Fix AudioRepository mute/unmute parameters order

Flag: aconfig new_volume_panel TEAMFOOD
Test: manual on the phone
Test: atest AudioRepositoryTest
Test: atest AudioVolumeInteractorTest
Test: atest VolumeSliderInteractorTest
Fixes: 327586835
Fixes: 327596143
Change-Id: I887d97551cd9027af355fd0ebc064b52fe295f6b