[gnome-shell] data: Revert accidental submodule change

[Florian Müllner <fmuellner src gnome org>]

commit 17a4044d971d2278dc5ca8df6cb65801ef012231
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Aug 5 14:24:42 2015 +0200

    data: Revert accidental submodule change

 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 e0e7438..23e0bc1 160000
--- a/data/theme/gnome-shell-sass
+++ b/data/theme/gnome-shell-sass
@@ -1 +1 @@
-Subproject commit e0e74382f166e596f1c8af4765404bfb65db76a2
+Subproject commit 23e0bc1e71d0cd84d580916638ec5755f2f2d4e1