[gtk] Remove border-half-pixel reftest from xfail

[Matthias Clasen <matthiasc src gnome org>]

commit 47f2a6cafd1b2353a3414147ec083e84e9d95885
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Feb 13 09:39:27 2020 -0500

    Remove border-half-pixel reftest from xfail
    
    It passes both locally and on ci now.

 testsuite/reftests/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/testsuite/reftests/meson.build b/testsuite/reftests/meson.build
index 33ecccbe5a..c519c6137c 100644
--- a/testsuite/reftests/meson.build
+++ b/testsuite/reftests/meson.build
@@ -422,7 +422,6 @@ xfails = [
   'background-color-transparent.ui',
   'background-image-multiple.ui',
   'background-origin.ui',
-  'border-half-pixel.ui',
   'sizegroups-evolution-identity-page.ui',
   'textview-border-windows.ui',
   'window-show-contents-on-map.ui',