[gnome-shell/wip/jimmac/system-grey-tweak] theme: update system grey background

[Jakub Steiner <jimmac src gnome org>]

commit c044aac424a9aaf2514344b88d54fe0c238c7bf6
Author: Jakub Steiner <jimmac gmail com>
Date:   Tue Feb 4 12:29:02 2020 +0100

    theme: update system grey background
    
    Fixes https://gitlab.gnome.org/GNOME/gnome-shell/issues/2174

 data/theme/gnome-shell-sass/widgets/_screen-shield.scss | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/data/theme/gnome-shell-sass/widgets/_screen-shield.scss 
b/data/theme/gnome-shell-sass/widgets/_screen-shield.scss
index 823ac81849..45de8c3ee9 100644
--- a/data/theme/gnome-shell-sass/widgets/_screen-shield.scss
+++ b/data/theme/gnome-shell-sass/widgets/_screen-shield.scss
@@ -70,8 +70,7 @@ $_screenshield_shadow: 0px 0px 6px rgba(0, 0, 0, 0.726);
 }
 
 #lockDialogGroup {
-  background: lighten(#2e3436, 8%) url(resource:///org/gnome/shell/theme/noise-texture.png);
-  background-repeat: repeat;
+  background-color: lighten(#2e3436, 8%);
 }
 
 #screenShieldNotifications {
@@ -80,4 +79,4 @@ $_screenshield_shadow: 0px 0px 6px rgba(0, 0, 0, 0.726);
     &:hover, &:focus { background-color: transparentize($bg_color,0.5); }
     &:active { background-color: transparentize($selected_bg_color,0.5); }
   }
-}
\ No newline at end of file
+}