_stream hud: Use block font for MvM scoreboard

[rbjaxter]

Courtesy of qkeitoe, the font entry is ScoreboardVerySmall. I will need to change the font used for the scoreboard stats, since it uses the same one. I think you can change the stat font easily enough, I assume MvM stats have individual entries like the default scoreboard does.

Only caveat is that your scores will be hidden in the scoreboard. Maybe I can just use whizblockless to show numbers? Might be an acceptable compromise there