Fix multiplayer player count color in dark themes | Temp fix until #12744: Add...

Fix multiplayer player count color in dark themes | Temp fix until #12744: Add green color for counts > 0 and < max_players - 1 (#12930)

* fix intended player count color in dark themes

* Refactor

* Change to green color for white and dark themes

* Add const to the colors and extra name for green color