[gnome-shell-sass] theme: use 99px radius

[Florian Müllner <fmuellner src gnome org>]

commit 4185da05028ee24d219b312e62b95dbeb45c2208
Author: Sam Hewitt <sam snwh org>
Date:   Fri Dec 20 16:33:13 2019 -0500

    theme: use 99px radius
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/904

 widgets/_app-grid.scss | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/widgets/_app-grid.scss b/widgets/_app-grid.scss
index 796ae96..83986cc 100644
--- a/widgets/_app-grid.scss
+++ b/widgets/_app-grid.scss
@@ -156,7 +156,7 @@ $app_grid_fg_color: #fff;
 .system-action-icon {
   background-color: rgba(0,0,0,0.8);
   color: #fff;
-  border-radius: 50%;
+  border-radius: 99px;
   icon-size: $app_icon_size * 0.5;
 }