[gimp] app: fix removing a GimpSymmetry from an image.

[Jehan Pagès <jehanp src gnome org>]

commit 04d8a2eed636d901b6aa69fcb3a4d188e6dbba9a
Author: Jehan <jehan girinstud io>
Date:   Thu Feb 11 16:45:50 2016 +0100

    app: fix removing a GimpSymmetry from an image.

 app/core/gimpimage-symmetry.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/core/gimpimage-symmetry.c b/app/core/gimpimage-symmetry.c
index 93d8ca5..6076fe7 100644
--- a/app/core/gimpimage-symmetry.c
+++ b/app/core/gimpimage-symmetry.c
@@ -121,7 +121,7 @@ gimp_image_symmetry_remove (GimpImage    *image,
   private = GIMP_IMAGE_GET_PRIVATE (image);
 
   if (private->active_symmetry == sym)
-    gimp_image_set_active_symmetry (image, G_TYPE_NONE);
+    gimp_image_set_active_symmetry (image, GIMP_TYPE_SYMMETRY);
 
   private->symmetries = g_list_remove (private->symmetries, sym);
   g_object_unref (sym);