[gtk/matthiasc/for-main] widget-factory: Fix a missing export

[Matthias Clasen <matthiasc src gnome org>]

commit 7c5d71ebf63250f39e4520e7bd54b2e4b9eb1df2
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jul 7 21:44:57 2022 -0400

    widget-factory: Fix a missing export
    
    This broke when we started using a scope.

 demos/widget-factory/widget-factory.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/demos/widget-factory/widget-factory.c b/demos/widget-factory/widget-factory.c
index b2adc2b1b7..7e30b8b9e8 100644
--- a/demos/widget-factory/widget-factory.c
+++ b/demos/widget-factory/widget-factory.c
@@ -2098,6 +2098,7 @@ activate (GApplication *app)
   gtk_builder_cscope_add_callback (scope, mode_switch_state_set);
   gtk_builder_cscope_add_callback (scope, level_scale_value_changed);
   gtk_builder_cscope_add_callback (scope, transition_speed_changed);
+  gtk_builder_cscope_add_callback (scope, reset_icon_size);
   gtk_builder_set_scope (builder, scope);
   g_object_unref (scope);
   if (!gtk_builder_add_from_resource (builder, "/org/gtk/WidgetFactory4/widget-factory.ui", &error))