[gnome-shell] style: Fix style class name

[Florian Müllner <fmuellner src gnome org>]

commit eb8b82b62a2af07c2ffdc38dcc9448b60deac5fd
Author: Florian Müllner <fmuellner gnome org>
Date:   Thu Jan 23 17:23:13 2020 +0100

    style: Fix style class name
    
    Whoops, this never worked: ShellApp sets a style class of .fallback-app-icon,
    while the CSS used .fallback-window-icon.
    
    Let's go with the former ...
    
    https://gitlab.gnome.org/GNOME/gnome-shell/issues/1779

 data/theme/gnome-shell-sass/widgets/_message-list.scss | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/theme/gnome-shell-sass/widgets/_message-list.scss 
b/data/theme/gnome-shell-sass/widgets/_message-list.scss
index bc80c3f2e8..adedcf71de 100644
--- a/data/theme/gnome-shell-sass/widgets/_message-list.scss
+++ b/data/theme/gnome-shell-sass/widgets/_message-list.scss
@@ -84,7 +84,7 @@
     }
 
     // fallback
-    > .fallback-window-icon {
+    > .fallback-app-icon {
       width: $base_icon_size;
       height: $base_icon_size;
     }