[gnome-control-center] mouse: Fix stretched "Test Your Settings" button

[Yosef Or Boczko <yoseforb src gnome org>]

commit ca61b4dce92b47696a49fab15f75f96fb5d839b8
Author: Yosef Or Boczko <yoseforb gmail com>
Date:   Wed Aug 21 13:48:20 2013 +0300

    mouse: Fix stretched "Test Your Settings" button

 panels/mouse/cc-mouse-panel.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/panels/mouse/cc-mouse-panel.c b/panels/mouse/cc-mouse-panel.c
index e9b2351..c17cd07 100644
--- a/panels/mouse/cc-mouse-panel.c
+++ b/panels/mouse/cc-mouse-panel.c
@@ -100,6 +100,7 @@ cc_mouse_panel_constructed (GObject *object)
   button = gtk_button_new_with_mnemonic (_("Test Your _Settings"));
   gtk_style_context_add_class (gtk_widget_get_style_context (button),
                                "text-button");
+  gtk_widget_set_valign (button, GTK_ALIGN_CENTER);
   gtk_box_pack_start (GTK_BOX (box), button, FALSE, FALSE, 0);
   gtk_widget_set_visible (button, TRUE);