[gtk/snazzy-demo: 3/4] gtk-demo: Use duck in transitions to get some alpha example

[Alexander Larsson <alexl src gnome org>]

commit 5d4a6940fa45c3ab9c800e47be1695e1817637d9
Author: Alexander Larsson <alexl redhat com>
Date:   Wed Sep 30 16:25:30 2020 +0200

    gtk-demo: Use duck in transitions to get some alpha example

 demos/gtk-demo/gltransition.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/demos/gtk-demo/gltransition.c b/demos/gtk-demo/gltransition.c
index 8106e4ea89..9977a317f4 100644
--- a/demos/gtk-demo/gltransition.c
+++ b/demos/gtk-demo/gltransition.c
@@ -151,7 +151,7 @@ make_shader_stack (const char *name,
   gtk_shader_stack_set_shader (GTK_SHADER_STACK (stack), shader);
   g_object_unref (shader);
 
-  child = gtk_picture_new_for_resource ("/css_pixbufs/background.jpg");
+  child = gtk_picture_new_for_resource ("/css_blendmodes/ducky.png");
   gtk_picture_set_can_shrink (GTK_PICTURE (child), TRUE);
   gtk_shader_stack_add_child (GTK_SHADER_STACK (stack), child);