[gtk+] Temporarily remove window-border reftest

[Matthias Clasen <matthiasc src gnome org>]

commit cf6695088e1fe98acdd2ac2e3b5c2f0dd4e7cc5b
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed May 1 16:51:45 2013 -0400

    Temporarily remove window-border reftest
    
    It is broken by unfinished csd changes.

 tests/reftests/window-border-width.ref.ui |   23 -----------------------
 tests/reftests/window-border-width.ui     |   17 -----------------
 2 files changed, 0 insertions(+), 40 deletions(-)