[tomboy] Update GTK# download link

[Alex Tereschenko <alexter src gnome org>]

commit 1fef15e4e1ed98adb474c6a8238ee3a2c3fa00fe
Author: Alex Tereschenko <frozen and blue gmail com>
Date:   Sun Aug 28 21:36:07 2016 +0200

    Update GTK# download link

 Setup/Setup.wxs |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Setup/Setup.wxs b/Setup/Setup.wxs
index 8ef5136..6a0e145 100644
--- a/Setup/Setup.wxs
+++ b/Setup/Setup.wxs
@@ -56,7 +56,7 @@
                <Property Id="GTKSHARPNOVELLINSTALLVERSION" Secure="yes">
                        <RegistrySearch Id='GtksharpnovellRegistry' Type='raw' Root='HKLM' 
Key='Software\Xamarin\GtkSharp\Version' />
                </Property>
-               <Condition Message="This setup requires Gtk# for .NET (version 2.12.20 or higher). Please 
download the latest installer from http://www.mono-project.com/GtkSharp ">
+               <Condition Message="This setup requires Gtk# for .NET (version 2.12.20 or higher). Please 
download the latest installer from http://www.mono-project.com/download/ ">
                        <![CDATA[GTKSHARPNOVELLINSTALLVERSION >= "2.12.20" OR (GTKSHARPNOVELLINSTALLVERSION 
<< "2.12.1" AND GTKSHARPNOVELLINSTALLVERSION <> "2.12.1") OR REMOVE ~= "ALL"]]>
                </Condition>