TTT: Fixed scoreboard scroll bar covering player mute button

Shifted the columns slightly to the left when the scroll abr is visible, preventing it from covering the mute button.

Changes this http://steamcommunity.com/sharedfiles/filedetails/?id=213810898  into this http://steamcommunity.com/sharedfiles/filedetails/?id=213811013

No differences when the scrollbar is not visible.