clientId replay bugfix (was picking first clientID in the array) (#3369)

## Description:

clientId replay bugfix (was picking first clientID in the array)

https://discord.com/channels/1359946986937258015/1479543573404844042

## 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:

w.o.n

src/core/execution/ExecutionManager.ts

@@ -36,7 +36,7 @@ export class Executor {
   constructor(
     private mg: Game,
     private gameID: GameID,
-    private clientID: ClientID,
+    private clientID: ClientID | undefined,
   ) {
     // Add one to avoid id collisions with bots.
     this.random = new PseudoRandom(simpleHash(gameID) + 1);