[gnome-shell] style: Force symbolic icons in quick settings

[Marge Bot <marge-bot src gnome org>]

commit dcc54c041fb1c3afe999727002299ed20a28bcba
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Aug 10 16:48:25 2022 +0200

    style: Force symbolic icons in quick settings
    
    The icon for the Settings toggle comes from the .desktop file,
    so isn't symbolic by default. Enforce that via the -st-icon-style
    property, like the .aggregate-menu style did.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2419>

 data/theme/gnome-shell-sass/widgets/_quick-settings.scss | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/data/theme/gnome-shell-sass/widgets/_quick-settings.scss 
b/data/theme/gnome-shell-sass/widgets/_quick-settings.scss
index 50342434de..225ab486cf 100644
--- a/data/theme/gnome-shell-sass/widgets/_quick-settings.scss
+++ b/data/theme/gnome-shell-sass/widgets/_quick-settings.scss
@@ -91,6 +91,8 @@
 .quick-settings-system-item {
   & > StBoxLayout { spacing: 2 * $base_padding; }
 
+  .icon-button > StIcon { -st-icon-style: symbolic; }
+
   & .power-item {
     min-height: 0;
     min-width: 0;