[gnome-photos/wip/jimmac/preview-shading] theme: properly prefixed property

[Jakub Steiner <jimmac src gnome org>]

commit a65a5d5dd0ef693de55600ae93b8bc5fd93ecbaf
Author: Jakub Steiner <jimmac gmail com>
Date:   Thu Jan 10 15:40:10 2019 +0100

    theme: properly prefixed property
    
    - forgot gtk extensions are properly prefixed now

 data/Adwaita.css | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/Adwaita.css b/data/Adwaita.css
index 144a4986..14684529 100644
--- a/data/Adwaita.css
+++ b/data/Adwaita.css
@@ -49,5 +49,5 @@ GdMainIconView.content-view.cell:active {
 button.photos-tool-filter-button:checked {
     background: @theme_selected_bg_color;
     color: @theme_selected_fg_color;
-    icon-shadow: 0 3px 3px shade(@theme_selected_bg_color,0.7);
+    -gtk-icon-shadow: 0 3px 3px shade(@theme_selected_bg_color,0.7);
 }