cleanup: Clean up unused imports

Spotted by eslint.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/399

js/ui/notificationDaemon.js

@@ -1,6 +1,5 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 
-const Clutter = imports.gi.Clutter;
 const GdkPixbuf = imports.gi.GdkPixbuf;
 const Gio = imports.gi.Gio;
 const GLib = imports.gi.GLib;
@@ -12,7 +11,6 @@ const Config = imports.misc.config;
 const Main = imports.ui.main;
 const MessageTray = imports.ui.messageTray;
 const Params = imports.misc.params;
-const Util = imports.misc.util;
 
 const { loadInterfaceXML } = imports.misc.fileUtils;