[gnome-shell] background: Fix the check for spanning backgrounds

[Jasper St. Pierre <jstpierre src gnome org>]

commit 04ea95049a0e35825a502bb1dc2ff65e3cfe23b2
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Dec 3 15:41:42 2013 -0500

    background: Fix the check for spanning backgrounds
    
    this._monitorIndex does not exist, and neither does
    MetaBackground.monitor_index...
    
    https://bugzilla.gnome.org/show_bug.cgi?id=719803

 js/ui/background.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/background.js b/js/ui/background.js
index c50ae29..1f9e494 100644
--- a/js/ui/background.js
+++ b/js/ui/background.js
@@ -222,7 +222,7 @@ const BackgroundCache = new Lang.Class({
                 continue;
 
             if (params.style == GDesktopEnums.BackgroundStyle.SPANNED &&
-                this._images[i].monitor_index != this._monitorIndex)
+                this._images[i].monitor != params.monitorIndex)
                 continue;
 
             candidateContent = this._images[i];