Some hud fixes (by Confusion)

https://github.com/STJr/SRB2/pull/472

Since Confusion never opened a merge request here, and now seems to be absent, I figured I'd port it.

List of fixes from original pull request:

• 32 players table showing alive players as transparent and dead ones as solid.
• Dual race hud showing players' time horizontally skewed.
• Scoreboard converting to the 32 view only when it wants to show > 20 players, yet the actual capacity for the dual scoreboard is 18.