[gnome-shell] screenshield: use the correct actor for the background

[Cosimo Cecchi <cosimoc src gnome org>]

commit b9d50584d8ec01ed6c37f74e2a6b59c906e07e61
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Tue Nov 6 17:44:11 2012 -0500

    screenshield: use the correct actor for the background
    
    Commit 4fd690333aa3713b48128cded71a3f11234729a9 added the GLSL snippet to
    the background actor, but then discarded the newly created actor.

 js/ui/screenShield.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/screenShield.js b/js/ui/screenShield.js
index e47f0aa..7c7c7c0 100644
--- a/js/ui/screenShield.js
+++ b/js/ui/screenShield.js
@@ -409,7 +409,7 @@ const ScreenShield = new Lang.Class({
                                          GLSL_BLUR_EFFECT_CODE,
                                          true);
         this._background = new St.Bin({ style_class: 'screen-shield-background',
-                                        child: Meta.BackgroundActor.new_for_screen(global.screen) });
+                                        child: backgroundActor });
         this._lockScreenGroup.add_actor(this._background);
         this._lockScreenGroup.add_actor(this._lockScreenContents);