[gnome-boxes] wizard-source: Fix a typo from commit 770522a1

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit 8aacf12e157221b84e47753cbf4705a26045d1d4
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Sat Nov 16 21:40:36 2013 +0000

    wizard-source: Fix a typo from commit 770522a1

 src/wizard-source.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/wizard-source.vala b/src/wizard-source.vala
index ce58440..46b5ef7 100644
--- a/src/wizard-source.vala
+++ b/src/wizard-source.vala
@@ -196,7 +196,7 @@ private class Boxes.WizardSource: GLib.Object {
                 }
 
             if (obsolete)
-                main_vbox.remove (child);
+                media_vbox.remove (child);
         }
 
         foreach (var media in medias) {