Remove unneeded type assertion of an empty array.

src/execution.ts

@@ -87,7 +87,7 @@ export async function queueRequest(request: DiscordApi.Message | DiscordApi.Inte
 
   const messagesForChannel = channelsRunning.ensure(
     request.channelId,
-    () => { return [] as DiscordApi.Message[]; },
+    () => { return []; },
   );
   const shouldStart = messagesForChannel.length == 0;
   messagesForChannel.push(request);