Fix reftests

Multiple reftests were damaged by the element name transition.
Repair them. The region reftests are no longer needed, since
we no longer do regions.

testsuite/reftests/shorthand-entry-border.css

@@ -7,11 +7,11 @@ GtkWidget {
   border-right-width: 5px;
 }
 
-GtkEntry {
+entry {
   border-width: 10px 20px;
 }
 
-.entry {
+entry {
   border-left-width: 10px;
   border-right-width: 10px;
 }