fix: Startup signals not used correctly

As the game start signal was `undefined` initially, it caused the promise race to complete instantly, breaking the entire wait loop approach.

packages/userscript/source/UserScript.ts

@@ -192,6 +192,8 @@ export class UserScript {
   }
 
   static async waitForGame(timeout = 30000): Promise<GamePage> {
+    const signals: Array<Promise<unknown>> = [sleep(2000)];
+
     if (isNil(UserScript._gameStartSignal) && typeof dojo !== "undefined") {
       UserScript._gameStartSignal = new Promise(resolve => {
         UserScript._gameStartSignalResolver = resolve;
@@ -203,6 +205,10 @@ export class UserScript {
       });
     }
 
+    if (!isNil(UserScript._gameStartSignal)) {
+      signals.push(UserScript._gameStartSignal);
+    }
+
     if (timeout < 0) {
       throw new Error("Unable to find game page. Giving up.");
     }
@@ -213,7 +219,7 @@ export class UserScript {
 
     cdebug(`Waiting for game... (timeout: ${Math.round(timeout / 1000)}s)`);
 
-    await Promise.race([UserScript._gameStartSignal, sleep(2000)]);
+    await Promise.race(signals);
     return UserScript.waitForGame(timeout - 2000);
   }