[retro-gtk] demo: Fix a compilation warning

[Adrien Plazas <aplazas src gnome org>]

commit 0cb2aad2a64be58338c3fe4c79b98b5033072935
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu May 11 10:44:53 2017 +0200

    demo: Fix a compilation warning

 demos/retro-demo.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/demos/retro-demo.c b/demos/retro-demo.c
index 74f16db..6c53bb5 100644
--- a/demos/retro-demo.c
+++ b/demos/retro-demo.c
@@ -91,7 +91,7 @@ retro_demo_activate (GApplication *application)
   self->pa_player = retro_pa_player_new ();
   retro_pa_player_set_core (self->pa_player, self->core);
 
-  window = gtk_window_new (GTK_WIN_POS_NONE);
+  window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_window_set_default_size (GTK_WINDOW (window), 640, 480);
   gtk_container_add (GTK_CONTAINER (window), GTK_WIDGET (self->display));