[gdm] chooser: Don't use deprecated GtkVBox

[Robert Ancell <rancell src gnome org>]

commit 0ecff94d4c90d71357c9cc46fd942558ab9fb4e1
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Dec 5 15:11:09 2017 +1300

    chooser: Don't use deprecated GtkVBox

 chooser/gdm-host-chooser-widget.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/chooser/gdm-host-chooser-widget.c b/chooser/gdm-host-chooser-widget.c
index e250790..ae12b1a 100644
--- a/chooser/gdm-host-chooser-widget.c
+++ b/chooser/gdm-host-chooser-widget.c
@@ -90,7 +90,7 @@ static void     gdm_host_chooser_widget_class_init  (GdmHostChooserWidgetClass *
 static void     gdm_host_chooser_widget_init        (GdmHostChooserWidget      *host_chooser_widget);
 static void     gdm_host_chooser_widget_finalize    (GObject                   *object);
 
-G_DEFINE_TYPE (GdmHostChooserWidget, gdm_host_chooser_widget, GTK_TYPE_VBOX)
+G_DEFINE_TYPE (GdmHostChooserWidget, gdm_host_chooser_widget, GTK_TYPE_BOX)
 
 #define GDM_XDMCP_PROTOCOL_VERSION 1001
 #define SCAN_TIMEOUT 30