[gnome-control-center] shell: Fix stretched header bar lock button

[Yosef Or Boczko <yoseforb src gnome org>]

commit c713b4f972fdbe3b1600f6713569efe697ca6fcc
Author: Yosef Or Boczko <yoseforb gmail com>
Date:   Wed Aug 21 13:47:28 2013 +0300

    shell: Fix stretched header bar lock button

 shell/cc-window.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/shell/cc-window.c b/shell/cc-window.c
index 58f8e13..aa7b822 100644
--- a/shell/cc-window.c
+++ b/shell/cc-window.c
@@ -1482,6 +1482,7 @@ create_header (CcWindow *self)
   priv->lock_button = gtk_lock_button_new (NULL);
   gtk_style_context_add_class (gtk_widget_get_style_context (priv->lock_button),
                                "text-button");
+  gtk_widget_set_valign (priv->lock_button, GTK_ALIGN_CENTER);
   gtk_widget_set_no_show_all (priv->lock_button, TRUE);
   gtk_container_add (GTK_CONTAINER (priv->top_right_box), priv->lock_button);
 }