[gtk] reftests: Fix shorthand-entry-border test

[Benjamin Otte <otte src gnome org>]

commit fee8f6b9beb49ed1ef6c2dd7ba53f917aef5067f
Author: Benjamin Otte <otte redhat com>
Date:   Fri Mar 29 04:11:11 2019 +0100

    reftests: Fix shorthand-entry-border test
    
    We weren't setting CSS back to defaults, so the border highlight
    transition would be at different stages when the 2 snapshots happened.

 testsuite/reftests/shorthand-entry-border.css | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/testsuite/reftests/shorthand-entry-border.css b/testsuite/reftests/shorthand-entry-border.css
index b8f28f68a3..aae1827d55 100644
--- a/testsuite/reftests/shorthand-entry-border.css
+++ b/testsuite/reftests/shorthand-entry-border.css
@@ -1,8 +1,6 @@
-* {
-  border-radius: 0;
-}
+@import "reset-to-defaults.css";
 
-GtkWidget {
+widget {
   border-right-width: 5px;
 }