[seahorse] KeyManager: don't use set_default_geometry()

[Niels De Graef <nielsdg src gnome org>]

commit 530736dcbd89839ec3e594bb74d0a9ee57c38698
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Mon Aug 13 19:33:49 2018 +0200

    KeyManager: don't use set_default_geometry()
    
    This was deprecated by Gtk.Window.set_default_size() quite some time
    ago.
    
    Fixes another deprecation warning.

 src/key-manager.vala | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/key-manager.vala b/src/key-manager.vala
index 95984221..e4710ebd 100644
--- a/src/key-manager.vala
+++ b/src/key-manager.vala
@@ -74,7 +74,7 @@ public class Seahorse.KeyManager : Catalog {
         );
         this.settings = new GLib.Settings("org.gnome.seahorse.manager");
 
-        set_default_geometry(640, 476);
+        set_default_size(640, 476);
         set_events(Gdk.EventMask.POINTER_MOTION_MASK
                    | Gdk.EventMask.POINTER_MOTION_HINT_MASK
                    | Gdk.EventMask.BUTTON_PRESS_MASK