[libadwaita/libadwaita-1-0] stylesheet: Remove an unused variable

[Alexander Mikhaylenko <alexm src gnome org>]

commit 725d105ce67ecce6e5087a35dbeec20eb9731ebe
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Sun Feb 13 03:16:00 2022 +0500

    stylesheet: Remove an unused variable
    
    
    (cherry picked from commit 2d18a28e2b1d035b26ece0ba871e2061bc79ffb6)

 src/stylesheet/widgets/_scrolling.scss | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/src/stylesheet/widgets/_scrolling.scss b/src/stylesheet/widgets/_scrolling.scss
index 2d669730..a37cd52a 100644
--- a/src/stylesheet/widgets/_scrolling.scss
+++ b/src/stylesheet/widgets/_scrolling.scss
@@ -1,5 +1,3 @@
-$_scrollbar_bg_color: transparentize(black, .9);
-
 scrollbar {
   $_slider_min_length: 40px;
   $_slider_width: 8px;