Rethink sound icon clickable area for pinned tabs

[mduchev]

On a pinned tab, playing some sound, in the hurry, one can click on the sound icon instead of the tab itself. This way, instead of focusing the tab, we'll be muting it, resulting in couple more clicks until we're at the desired state (unmuted & focused tab). One possible solution is to (have the option to) keep the icon only as an indicative measure (i.e. non-clickable)