[libdazzle] style: be more specific with CSS selector

[Christian Hergert <chergert src gnome org>]

commit 3f86e6ba1fcbce8c6068b857cc9199ada8feb6c9
Author: Christian Hergert <chergert redhat com>
Date:   Thu Jun 29 15:50:10 2017 -0700

    style: be more specific with CSS selector

 data/themes/shared/shared-stacklist.css |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/themes/shared/shared-stacklist.css b/data/themes/shared/shared-stacklist.css
index 14e0e07..24e5e64 100644
--- a/data/themes/shared/shared-stacklist.css
+++ b/data/themes/shared/shared-stacklist.css
@@ -8,7 +8,7 @@ dzlstacklist row label.dim-label {
 dzlstacklist row:backdrop {
   color: @theme_unfocused_fg_color;
 }
-dzlstacklist row image {
+dzlstacklist row > box > image:first-child {
   margin: 6px 12px;
   min-height: 16px;
   min-width: 16px;