[gnome-shell-extensions] Fix a translatable string

[Piotr Drąg <piotrdrag src gnome org>]

commit 23981289d5c453b6478884b9c6b65e9bfabbaf80
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sun Sep 15 02:41:24 2013 +0200

    Fix a translatable string
    
    So the old gettext would pick it up. Not a string freeze break.

 extensions/window-list/extension.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/extensions/window-list/extension.js b/extensions/window-list/extension.js
index 3546ff3..bccdb39 100644
--- a/extensions/window-list/extension.js
+++ b/extensions/window-list/extension.js
@@ -740,7 +740,7 @@ const WindowList = new Lang.Class({
 
         Main.layoutManager.addChrome(this.actor, { affectsStruts: true,
                                                    trackFullscreen: true });
-        Main.ctrlAltTabManager.addGroup(this.actor, _('Window List'), 'start-here-symbolic');
+        Main.ctrlAltTabManager.addGroup(this.actor, _("Window List"), 'start-here-symbolic');
 
         this._appSystem = Shell.AppSystem.get_default();
         this._appStateChangedId =