Rework VolumeSlider content to accomodate enough space for disabledMessage animation

The problem is that content width changes after the animation is complete, which causes it to jump from being on the left side to being on the right side of the indicator.

Flag: aconfig new_volume_panel TEAMFOOD
Test: manual on the phone with different screen and text scales
Bug: 330477873
Change-Id: I18a7b97ccf6b0d6a416048c53fa636fcf5b9bf38