[gnome-builder] theme: fix deprecation warning

[Christian Hergert <chergert src gnome org>]

commit 570d9f539b8a86432aae1594f78b30c9a3619de8
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jan 13 15:36:49 2016 -0800

    theme: fix deprecation warning

 data/theme/Adwaita-dark.css |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/theme/Adwaita-dark.css b/data/theme/Adwaita-dark.css
index 70c15de..58cfcd1 100644
--- a/data/theme/Adwaita-dark.css
+++ b/data/theme/Adwaita-dark.css
@@ -114,7 +114,7 @@ layouttabbar button {
   padding: 9px;
 }
 
-layouttab button:insensitive {
+layouttab button:disabled {
   opacity: 0.3;
 }