[gnome-documents] mainToolbar: don't forget to show night-mode button

[Cosimo Cecchi <cosimoc src gnome org>]

commit 89f63bd1b78a9e46a8cce1fea366ee4d3b9462c8
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Sat Nov 12 18:37:01 2016 -0800

    mainToolbar: don't forget to show night-mode button

 src/mainToolbar.js |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/src/mainToolbar.js b/src/mainToolbar.js
index 3a356e9..8aeb8dd 100644
--- a/src/mainToolbar.js
+++ b/src/mainToolbar.js
@@ -98,7 +98,8 @@ const MainToolbar = new Lang.Class({
     addNightmodeButton: function() {
         let nightmodeButton = new Gtk.ToggleButton({ image: new Gtk.Image ({ icon_name: 
'display-brightness-symbolic' }),
                                                      tooltip_text: _("Night Mode"),
-                                                     action_name: 'app.night-mode' });
+                                                     action_name: 'app.night-mode',
+                                                     visible: true });
         this.toolbar.pack_end(nightmodeButton);
         return nightmodeButton;
     },