[mutter] monitor: Keep the dbus night-light-supported property in sync

[Marge Bot <marge-bot src gnome org>]

commit 89b8edcc6faefb5d2788bb5fa6d91b92181a4cde
Author: Sebastian Wick <sebastian wick redhat com>
Date:   Tue Sep 13 20:03:42 2022 +0200

    monitor: Keep the dbus night-light-supported property in sync
    
    Fixes #2424
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2623>

 src/backends/meta-monitor-manager.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/backends/meta-monitor-manager.c b/src/backends/meta-monitor-manager.c
index a60518850d..5c9a540299 100644
--- a/src/backends/meta-monitor-manager.c
+++ b/src/backends/meta-monitor-manager.c
@@ -1184,6 +1184,8 @@ update_night_light_supported (MetaMonitorManager *manager)
   priv->night_light_supported = night_light_supported;
   g_object_notify_by_pspec (G_OBJECT (manager),
                             obj_props[PROP_NIGHT_LIGHT_SUPPORTED]);
+  meta_dbus_display_config_set_night_light_supported (manager->display_config,
+                                                      night_light_supported);
 }
 
 void