remove known world (#914)

## Description:
Remove known world map to avoid copyright infringement.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

<DISCORD USERNAME>

src/core/configuration/DefaultConfig.ts

@@ -62,7 +62,6 @@ const numPlayersConfig = {
   [GameMapType.Pangaea]: [40, 20, 30],
   [GameMapType.World]: [150, 80, 50],
   [GameMapType.WorldMapGiant]: [150, 100, 60],
-  [GameMapType.KnownWorld]: [50, 40, 30],
   [GameMapType.Halkidiki]: [50, 40, 30],
 } as const satisfies Record<GameMapType, [number, number, number]>;