[gnome-boxes] wizard-source: Bring back the 'back' button

[Zeeshan Ali Khattak <zeeshanak src gnome org>]

commit ec4e3e17d78968ea458519089946e1ba7692534d
Author: Zeeshan Ali (Khattak) <zeeshanak gnome org>
Date:   Tue Mar 11 13:56:49 2014 +0000

    wizard-source: Bring back the 'back' button
    
    In ee26f7a, we forgot to set the visibility of this button. This patches
    fixes the regression.

 data/ui/wizard-source.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/ui/wizard-source.ui b/data/ui/wizard-source.ui
index d1e675f..dfa0a61 100644
--- a/data/ui/wizard-source.ui
+++ b/data/ui/wizard-source.ui
@@ -169,6 +169,7 @@
         </style>
         <child>
           <object class="GtkButton" id="url_back_button">
+          <property name="visible">True</property>
             <signal name="clicked" handler="on_url_back_button_clicked"/>
             <style>
               <class name="boxes-menu-row"/>