[gnome-software] trivial: Support older versions of GTK

[Richard Hughes <rhughes src gnome org>]

commit 3d4c8099ff5a0fd51d22af6ef4a6b4f91f928484
Author: Richard Hughes <richard hughsie com>
Date:   Mon Feb 1 12:09:22 2016 +0000

    trivial: Support older versions of GTK

 src/gtk-style.css |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/gtk-style.css b/src/gtk-style.css
index 505f0a8..58eb399 100644
--- a/src/gtk-style.css
+++ b/src/gtk-style.css
@@ -33,7 +33,8 @@
        padding: 8px;
 }
 
-.kudo-pill:disabled {
+/* should be :disabled but we need to support older versions of GTK */
+.kudo-pill:insensitive {
        background-color: shade(@theme_bg_color, 0.8);
 }