[gnome-music] artistalbum: Fix leftover from previous patch

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 146e5266a67a607b02b6e319f11c4bba674107a7
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Sun Nov 27 22:58:22 2016 +0100

    artistalbum: Fix leftover from previous patch

 gnomemusic/widgets/artistalbumwidget.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/gnomemusic/widgets/artistalbumwidget.py b/gnomemusic/widgets/artistalbumwidget.py
index f8af03f..090e15c 100644
--- a/gnomemusic/widgets/artistalbumwidget.py
+++ b/gnomemusic/widgets/artistalbumwidget.py
@@ -150,7 +150,7 @@ class ArtistAlbumWidget(Gtk.Box):
 
         for disc_nr in discs:
             disc = self.create_disc_box(disc_nr, discs[disc_nr])
-            self._disc_listbox.insert(disc, -1)
+            self._disc_listbox.add(disc)
             if len(discs) == 1:
                 disc.show_disc_label(False)