Fixed copy-paste error in code

web/react/components/channel_notifications.jsx

@@ -21,7 +21,7 @@ module.exports = React.createClass({
             var notifyLevel = ChannelStore.getMember(channel_id).notify_level;
             var quietMode = false;
             if (notifyLevel === "quiet") quietMode = true;
-            self.setState({ notify_level: notifyLevel, quiet_mode: quietMode, title: button.getAttribute('data-channelid'), channel_id: channel_id });
+            self.setState({ notify_level: notifyLevel, quiet_mode: quietMode, title: button.getAttribute('data-title'), channel_id: channel_id });
         });
     },
     componentWillUnmount: function() {