fix bug of demo.conf

@@ -197,7 +197,7 @@ vhost players_chat {
             achannels       2;
             aparams {
             }
-            output          rtmp://127.0.0.1:[port]/[app]?vhost=players_pub/[stream];
+            output          rtmp://127.0.0.1:[port]/[app]?vhost=chat_hls/[stream];
         }
     }
 }