dash: Hide item labels

With the current dash layout of a single column, nearly every icon
label ends up ellipsized, even at the largest allowed icon size.
Not showing any labels appears to be the cleanest approach in this
case, so disable them in the dash.

https://bugzilla.gnome.org/show_bug.cgi?id=636156

js/ui/dash.js

@@ -26,6 +26,7 @@ RemoveFavoriteIcon.prototype = {
         this._iconActor = null;
         this.icon = new IconGrid.BaseIcon(_("Remove"),
                                            { setSizeManually: true,
+                                             showLabel: false,
                                              createIcon: Lang.bind(this, this._createIcon) });
         this.actor.set_child(this.icon.actor);
         this.actor._delegate = this;
@@ -192,7 +193,8 @@ Dash.prototype = {
 
     _addApp: function(app) {
         let display = new AppDisplay.AppWellIcon(app,
-                                                 { setSizeManually: true });
+                                                 { setSizeManually: true,
+                                                   showLabel: false });
         display._draggable.connect('drag-begin',
                                    Lang.bind(this, function() {
                                        display.actor.opacity = 50;