[metacity] preview-widget: use correct name for missing icon

[Alberts Muktupāvels <muktupavels src gnome org>]

commit 5f8df557b8dbe962f19e8b641c007073665ff878
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Mon Jan 26 18:54:30 2015 +0200

    preview-widget: use correct name for missing icon

 src/ui/preview-widget.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/ui/preview-widget.c b/src/ui/preview-widget.c
index 4a75a45..1032486 100644
--- a/src/ui/preview-widget.c
+++ b/src/ui/preview-widget.c
@@ -466,7 +466,7 @@ meta_preview_get_icon (void)
                                                    NULL);
       else
           default_icon = gtk_icon_theme_load_icon (theme,
-                                                   "gtk-missing-image",
+                                                   "image-missing",
                                                    META_ICON_WIDTH,
                                                    0,
                                                    NULL);
@@ -499,7 +499,7 @@ meta_preview_get_mini_icon (void)
                                                    NULL);
       else
           default_icon = gtk_icon_theme_load_icon (theme,
-                                                   "gtk-missing-image",
+                                                   "image-missing",
                                                    META_MINI_ICON_WIDTH,
                                                    0,
                                                    NULL);