[gtk+] Update expected output of notebook css node test

[Matthias Clasen <matthiasc src gnome org>]

commit e386fcae04052e5cb545105d020465262e46db78
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Jan 13 00:26:48 2016 -0500

    Update expected output of notebook css node test
    
    The stack node is new.

 testsuite/css/nodes/notebook.nodes |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/testsuite/css/nodes/notebook.nodes b/testsuite/css/nodes/notebook.nodes
index 947cc72..0e1288e 100644
--- a/testsuite/css/nodes/notebook.nodes
+++ b/testsuite/css/nodes/notebook.nodes
@@ -9,7 +9,8 @@
           label:dir(ltr)
         tab:dir(ltr)
           label:dir(ltr)
-    button.text-button:dir(ltr)
-      label:dir(ltr)
-    button.text-button:dir(ltr)
-      label:dir(ltr)
+    stack:dir(ltr)
+      button.text-button:dir(ltr)
+        label:dir(ltr)
+      button.text-button:dir(ltr)
+        label:dir(ltr)