[gtk+] Adwaita: remove unused selector in _common.scss

[Lapo Calamandrei <lapo src gnome org>]

commit 7698ac447ae3d9296c7e8793619ca4d31e0d9d5f
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Sat Feb 20 19:52:46 2016 +0100

    Adwaita: remove unused selector in _common.scss

 gtk/theme/Adwaita/_common.scss |    2 --
 1 files changed, 0 insertions(+), 2 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 193bbb2..d1c09bf 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -2593,8 +2593,6 @@ scale {
                                  (':backdrop', '-backdrop'),
                                  (':backdrop:disabled', '-backdrop-insensitive') {
 
-          &.fine-tune trough#{$nth_child} {}
-
           trough#{$nth_child} {
             slider {
               margin: 0 1px;