Correct player colour persistence, *actually* resolving #255.

An explanation for the approach: I started writing a whole system where an extra pflag would be defined for "colour is not currently the player's ACTUAL colour". Then I looked at the actual code flow that would be affected by it - the single line guarded by `if (forcereset)` - and decided it was simpler to just do an extra write in this once-per-player-per-frame function instead of increasing across-the-board complexity.