[gnome-shell] iconGrid: Add missing import for GLib

[Florian Müllner <fmuellner src gnome org>]

commit 32ddb6f739a03ff2647ea606103aecf14cbc89da
Author: Daniel van Vugt <daniel van vugt canonical com>
Date:   Tue Jul 23 14:14:50 2019 +0800

    iconGrid: Add missing import for GLib
    
    To silence warnings:
    
    JS ERROR: ReferenceError: GLib is not defined
    _updateIconSizes@resource:///org/gnome/shell/ui/iconGrid.js:771:9
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/1462

 js/ui/iconGrid.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/iconGrid.js b/js/ui/iconGrid.js
index 17ca0a98d..1dd79cc89 100644
--- a/js/ui/iconGrid.js
+++ b/js/ui/iconGrid.js
@@ -1,6 +1,6 @@
 // -*- mode: js; js-indent-level: 4; indent-tabs-mode: nil -*-
 
-const { Clutter, GObject, Meta, St } = imports.gi;
+const { Clutter, GLib, GObject, Meta, St } = imports.gi;
 
 const Params = imports.misc.params;
 const Tweener = imports.ui.tweener;