Equalize team sizes (#992)

## Description:

Ensure that team sizes are equal.

Closes #841

## 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
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/core/configuration/DefaultConfig.ts

@@ -137,11 +137,19 @@ export abstract class DefaultServerConfig implements ServerConfig {
     return 60 * 1000;
   }
 
-  lobbyMaxPlayers(map: GameMapType, mode: GameMode): number {
+  lobbyMaxPlayers(
+    map: GameMapType,
+    mode: GameMode,
+    numPlayerTeams: number | undefined,
+  ): number {
     const [l, m, s] = numPlayersConfig[map] ?? [50, 30, 20];
     const r = Math.random();
     const base = r < 0.3 ? l : r < 0.6 ? m : s;
-    return Math.min(mode === GameMode.Team ? Math.ceil(base * 1.5) : base, 150);
+    let p = Math.min(mode === GameMode.Team ? Math.ceil(base * 1.5) : base, l);
+    if (numPlayerTeams !== undefined) {
+      p -= p % numPlayerTeams;
+    }
+    return p;
   }
 
   workerIndex(gameID: GameID): number {