Properly decrement viewer count when RTMP viewers quit

src/server.ts

@@ -130,7 +130,7 @@ function init () {
 		let app: string = StreamPath.split("/")[1];
 		let key: string = StreamPath.split("/")[2];
 		// decrement viewer count
-		db.query('update user_meta,users set user_meta.viewers = user_meta.viewers - 1 where users.stream_key='+db.raw.escape(key));
+		db.query('update user_meta set viewers = viewers - 1 where username=(select username from users where stream_key='+db.raw.escape(key)+' limit 1)');
 	});
 }