Patch for 85666 - [ui-review] Empty Trash dialog issues

[Damon Chaplin <damon ximian com>]

I've added a patch to:

  http://bugzilla.gnome.org/show_bug.cgi?id=85666

It is UI review changes to the 'Empty Trash' confirmation dialog.

Unfortunately I had to create the dialog by hand to add the Delete icon
to the button and sort out the default button.

I changed it to be non-modal, though I'm not sure if we want to do that.
There was a big comment about why it was modal, but I'm not sure if it
is still relevant. (You can see it in the patch.)

Damon