[mutter] Use the correct image missing icon name from the icon naming spec

[William Jon McCann <mccann src gnome org>]

commit a53a40c43e7cc34f87c8ec08e88d065c2acb9410
Author: William Jon McCann <jmccann redhat com>
Date:   Sat Oct 2 16:35:19 2010 -0400

    Use the correct image missing icon name from the icon naming spec
    
    Fixes an assertion when the wrong icon can't be found.

 src/ui/ui.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/ui/ui.c b/src/ui/ui.c
index 8870cd0..53d9f87 100644
--- a/src/ui/ui.c
+++ b/src/ui/ui.c
@@ -533,7 +533,7 @@ meta_ui_get_default_window_icon (MetaUI *ui)
                                                    NULL);
       else
           default_icon = gtk_icon_theme_load_icon (theme,
-                                                   "gtk-missing-image",
+                                                   "image-missing",
                                                    META_ICON_WIDTH,
                                                    0,
                                                    NULL);
@@ -568,7 +568,7 @@ meta_ui_get_default_mini_icon (MetaUI *ui)
                                                    NULL);
       else
           default_icon = gtk_icon_theme_load_icon (theme,
-                                                   "gtk-missing-image",
+                                                   "image-missing",
                                                    META_MINI_ICON_WIDTH,
                                                    0,
                                                    NULL);