appDisplay: Remove the top padding from folder app grid

There already is a bottom padding defined for the name container of the
folder, so remove the top padding of the appGrid and make sure we can
show a few more icons inside the folder.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/1011

js/ui/appDisplay.js

@@ -1911,6 +1911,8 @@ var AppFolderDialog = GObject.registerClass({
             contentBox.get_width(),
             contentBox.get_height() - entryBoxHeight - spacing);
 
+        this._view._grid.topPadding = 0;
+
         super.vfunc_allocate(box, flags);
 
         // We can only start zooming after receiving an allocation