[krb5-auth-dialog] prefs: Use hide-on-close property

[Guido Günther <guidog src gnome org>]

commit d857a675be7e39eaec2983a6a719a00654745770
Author: Guido Günther <agx sigxcpu org>
Date:   Mon Oct 17 10:21:02 2022 +0200

    prefs: Use hide-on-close property
    
    hide_on_delete doesn't exist in GTK4

 src/ka-preferences.c               | 5 -----
 src/resources/ui/ka-preferences.ui | 1 +
 2 files changed, 1 insertion(+), 5 deletions(-)
---
diff --git a/src/ka-preferences.c b/src/ka-preferences.c
index 2c452c2..2d8d126 100644
--- a/src/ka-preferences.c
+++ b/src/ka-preferences.c
@@ -596,11 +596,6 @@ ka_preferences_init (KaPreferences *self)
 {
     self->priv = ka_preferences_get_instance_private (self);
     gtk_widget_init_template (GTK_WIDGET (self));
-
-    g_signal_connect (self,
-                      "delete-event",
-                      G_CALLBACK (gtk_widget_hide_on_delete),
-                      NULL);
 }
 
 
diff --git a/src/resources/ui/ka-preferences.ui b/src/resources/ui/ka-preferences.ui
index 1b0b71b..9ebf461 100644
--- a/src/resources/ui/ka-preferences.ui
+++ b/src/resources/ui/ka-preferences.ui
@@ -7,6 +7,7 @@
     <property name="page_increment">10</property>
   </object>
   <template class="KaPreferences" parent="GtkDialog">
+    <property name="hide-on-close">True</property>
     <property name="margin-bottom">5</property>
     <property name="margin-end">5</property>
     <property name="margin-start">5</property>