[gimp] app: GimpUndo's icon should be "edit-undo" not "gtk-undo"

[Michael Natterer <mitch src gnome org>]

commit a0e820865002ad232746678ceb1bc284aca2bbd6
Author: Michael Natterer <mitch gimp org>
Date:   Sat May 31 00:08:10 2014 +0200

    app: GimpUndo's icon should be "edit-undo" not "gtk-undo"

 app/core/gimpundo.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimpundo.c b/app/core/gimpundo.c
index 1b134b0..2a2d9db 100644
--- a/app/core/gimpundo.c
+++ b/app/core/gimpundo.c
@@ -135,7 +135,7 @@ gimp_undo_class_init (GimpUndoClass *klass)
 
   gimp_object_class->get_memsize    = gimp_undo_get_memsize;
 
-  viewable_class->default_icon_name = "gtk-undo";
+  viewable_class->default_icon_name = "edit-undo";
   viewable_class->get_popup_size    = gimp_undo_get_popup_size;
   viewable_class->get_new_preview   = gimp_undo_get_new_preview;