[gtksourceview] Adwaita-dark.xml: fix background pattern

[Christian Hergert <chergert src gnome org>]

commit d6c0aa75f862d409562ab4a476f299546ef0f621
Author: Christian Hergert <chergert redhat com>
Date:   Sun Jan 23 16:18:53 2022 -0800

    Adwaita-dark.xml: fix background pattern

 data/styles/Adwaita-dark.xml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/styles/Adwaita-dark.xml b/data/styles/Adwaita-dark.xml
index 3a00d4ed..5e4cdf5e 100644
--- a/data/styles/Adwaita-dark.xml
+++ b/data/styles/Adwaita-dark.xml
@@ -93,7 +93,7 @@
   <color name="yellow_6"                   value="#D38B09"/>
 
   <!-- Global Styles -->
-  <style name="background-pattern"         background="light_3"/>
+  <style name="background-pattern"         background="libadwaita-dark-alt"/>
   <style name="bracket-match"              bold="true"/>
   <style name="current-line"               background="libadwaita-dark-alt"/>
   <style name="current-line-number"        background="libadwaita-dark-alt" foreground="light_7"/>