[gitg] Use set_response_sensitive instead of directly use set_sensitive

[Ignacio Casal Quinteiro <icq src gnome org>]

commit f05ef258240cf5438d5c20bfd726bbe9cb7bc697
Author: Jose Manuel Pintor Freire <jmpintorfreire gmail com>
Date:   Tue Apr 16 15:31:08 2013 +0200

    Use set_response_sensitive instead of directly use set_sensitive

 gitg/gitg-window.vala | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/gitg/gitg-window.vala b/gitg/gitg-window.vala
index 522b2a7..3d3b02a 100644
--- a/gitg/gitg-window.vala
+++ b/gitg/gitg-window.vala
@@ -197,20 +197,18 @@ public class Window : Gtk.ApplicationWindow, GitgExt.Application, Initable, Gtk.
                                                  "dialog-clone",
                                                  "entry-url",
                                                  "filechooserbutton-location",
-                                                 "checkbutton-bare-repository",
-                                                 "ok-button");
+                                                 "checkbutton-bare-repository");
 
                var dlg = ret["dialog-clone"] as Gtk.Dialog;
                var entry_url = ret["entry-url"] as Gtk.Entry;
                var chooser = ret["filechooserbutton-location"] as Gtk.FileChooserButton;
                var bare = ret["checkbutton-bare-repository"] as Gtk.CheckButton;
-               var ok_button = ret["ok-button"] as Gtk.Button;
 
                dlg.modal = true;
                dlg.set_transient_for(this);
 
                entry_url.changed.connect((e) => {
-                       ok_button.set_sensitive(entry_url.text_length != 0);
+                       dlg.set_response_sensitive(Gtk.ResponseType.OK, entry_url.text_length > 0);
                });
 
                dlg.response.connect((d, id) => {