[AppSwitcher] Do not show the glow for icons in alt+tab dialog.

Unlike icons in the application well, do not show the glow used to
indicate running apps.  It is somewhat redundant here.  These are all
running apps and it is fairly clear from the window list if there are
multiple instances available, according to mccann.

https://bugzilla.gnome.org/show_bug.cgi?id=590563

js/ui/altTab.js

@@ -102,7 +102,7 @@ AltTabPopup.prototype = {
         // Contruct the AppIcons, sort by time, add to the popup
         let icons = [];
         for (let i = 0; i < apps.length; i++)
-            icons.push(new AppIcon.AppIcon(apps[i], AppIcon.MenuType.BELOW));
+            icons.push(new AppIcon.AppIcon(apps[i], AppIcon.MenuType.BELOW, false));
         icons.sort(Lang.bind(this, this._sortAppIcon));
         for (let i = 0; i < icons.length; i++)
             this._addIcon(icons[i]);