[gnome-klotski] Fix new CSS error

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 40b8b3f53390e9526b10ed7b6c14b3661f962507
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Feb 14 12:36:01 2016 -0600

    Fix new CSS error

 data/klotski.css |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/klotski.css b/data/klotski.css
index 88a558b..cec558e 100644
--- a/data/klotski.css
+++ b/data/klotski.css
@@ -37,6 +37,6 @@ treeview.toggle-like-pixbuf:disabled:checked {
 }
 
 /* https://bugzilla.gnome.org/show_bug.cgi?id=744531 */
-button.flat:insensitive {
+button.flat:disabled {
   color: @theme_unfocused_bg_color;
 }