This patch updates the 16px `player-volume-muted` to be a symlink to the corresponding status icon. Changes the 24px `audio-volume-muted` action icons to the new muted symbol introduced in {D17220}.
It also adjust the opacity of the inactive sound waves in the 24px `audio-volume-low` and `audio-volume-medium` icons to 0.25 to match the Breeze Plasma theme.