have master remove game id if it fails to fetch game from worker

src/server/Master.ts

@@ -196,7 +196,7 @@ app.post(
 async function fetchLobbies(): Promise<number> {
   const fetchPromises: Promise<GameInfo | null>[] = [];
 
-  for (const gameID of publicLobbyIDs) {
+  for (const gameID of new Set(publicLobbyIDs)) {
     const controller = new AbortController();
     setTimeout(() => controller.abort(), 5000); // 5 second timeout
     const port = config.workerPort(gameID);
@@ -211,6 +211,7 @@ async function fetchLobbies(): Promise<number> {
       .catch((error) => {
         log.error(`Error fetching game ${gameID}:`, error);
         // Return null or a placeholder if fetch fails
+        publicLobbyIDs.delete(gameID);
         return null;
       });