Add quick mute buttons, fix delete not updating playlist meta

lib/channel-new.js

@@ -1765,6 +1765,7 @@ Channel.prototype.deleteMedia = function (uid, callback) {
             self.sendAll("delete", {
                 uid: uid
             });
+            self.updatePlaylistMeta();
             self.sendPlaylistMeta(self.users);
             callback(null);
         } else {