[gnome-shell] Update gnome-shell-sass module

[Florian Müllner <fmuellner src gnome org>]

commit 900957d658fca1ff4d69cd162e023b4f16d4f832
Author: Florian Müllner <fmuellner gnome org>
Date:   Fri Nov 4 16:32:28 2016 +0100

    Update gnome-shell-sass module

 data/theme/gnome-shell-sass |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/theme/gnome-shell-sass b/data/theme/gnome-shell-sass
index b219008..ec992ca 160000
--- a/data/theme/gnome-shell-sass
+++ b/data/theme/gnome-shell-sass
@@ -1 +1 @@
-Subproject commit b2190083c256564258fce97645ae6da72e9d0f7f
+Subproject commit ec992caa801a82ad5870c0da709dfd8c37a1a707