[gtk+] Adwaita: Fix scrollbar theming a bit

[Matthias Clasen <matthiasc src gnome org>]

commit 0f0557157b5f9b2604a9db9c0830fdbe2226bae3
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Oct 7 19:10:58 2017 -0400

    Adwaita: Fix scrollbar theming a bit
    
    Reinstate the fine-tune mode scrollbars.

 gtk/theme/Adwaita/_common.scss |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index afb3a7e..bf01610 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -2398,7 +2398,7 @@ scrollbar {
     &:disabled { background-color: transparent; }
   }
 
-  &.fine-tune {
+  & range.fine-tune {
     slider {
       min-width: 4px;
       min-height: 4px;