[gnome-contacts] Forgot to remove an obsolete comment

[Niels De Graef <nielsdg src gnome org>]

commit 081b24b59b32030280a6e6681cea8cb9243d56cf
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Jun 24 13:58:46 2017 +0200

    Forgot to remove an obsolete comment

 src/contacts-window.vala |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/src/contacts-window.vala b/src/contacts-window.vala
index 0b6d89f..c1e56c5 100644
--- a/src/contacts-window.vala
+++ b/src/contacts-window.vala
@@ -458,7 +458,6 @@ public class Contacts.Window : Gtk.ApplicationWindow {
     set_shown_contact (null);
     this.select_button.active = false;
 
-    // XXX
     var msg = _("Contact deleted: “%s”").printf (contact.display_name);
     var b = new Button.with_mnemonic (_("_Undo"));