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/game/GameView.ts

@@ -657,7 +657,7 @@ export class GameView implements GameMap {
     public worker: WorkerClient,
     private _config: Config,
     private _mapData: TerrainMapData,
-    private _myClientID: ClientID,
+    private _myClientID: ClientID | undefined,
     private _myUsername: string,
     private _gameID: GameID,
     private humans: Player[],
@@ -785,7 +785,9 @@ export class GameView implements GameMap {
       }
     });
 
-    this._myPlayer ??= this.playerByClientID(this._myClientID);
+    if (this._myClientID) {
+      this._myPlayer ??= this.playerByClientID(this._myClientID);
+    }
 
     for (const unit of this._units.values()) {
       unit._wasUpdated = false;
@@ -1103,7 +1105,7 @@ export class GameView implements GameMap {
     );
   }
 
-  myClientID(): ClientID {
+  myClientID(): ClientID | undefined {
     return this._myClientID;
   }