fix donation not set on singleplayer (#2093)

## Description:
Bug: Donation to nations was not allowed in single player mode.

Always allow donation to Nations. Simplify the donation check logic.

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

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

evan

src/server/MapPlaylist.ts

@@ -77,8 +77,8 @@ export class MapPlaylist {
 
     // Create the default public game config (from your GameManager)
     return {
-      donateGold: true,
-      donateTroops: true,
+      donateGold: false,
+      donateTroops: false,
       gameMap: map,
       maxPlayers: config.lobbyMaxPlayers(map, mode, playerTeams),
       gameType: GameType.Public,