[gnome-control-center] Replace deprecated gtk_file_chooser_dialog_new_with_backend

[Thomas Hindoe Paaboel Andersen <thomashpa src gnome org>]

commit e01c1e2a64b836892bfc7a9d6852fc9b76b7ee8e
Author: Thomas Hindoe Paaboel Andersen <phomes gmail com>
Date:   Thu Jul 16 18:53:28 2009 +0200

    Replace deprecated gtk_file_chooser_dialog_new_with_backend
    
    Gtk+ uses gio directly now and gtk_file_chooser_dialog_new should work instead.
    
    Fixes part of GNOME bug #572325

 capplets/appearance/appearance-desktop.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/capplets/appearance/appearance-desktop.c b/capplets/appearance/appearance-desktop.c
index fd0dd64..bf2f5a1 100644
--- a/capplets/appearance/appearance-desktop.c
+++ b/capplets/appearance/appearance-desktop.c
@@ -627,10 +627,9 @@ wp_create_filechooser (AppearanceData *data)
   GtkFileFilter *filter;
 
   data->wp_filesel = GTK_FILE_CHOOSER (
-  		     gtk_file_chooser_dialog_new_with_backend (_("Add Wallpaper"),
+                     gtk_file_chooser_dialog_new (_("Add Wallpaper"),
                      GTK_WINDOW (appearance_capplet_get_widget (data, "appearance_window")),
                      GTK_FILE_CHOOSER_ACTION_OPEN,
-                     "gtk+",
                      GTK_STOCK_CANCEL,
                      GTK_RESPONSE_CANCEL,
                      GTK_STOCK_OPEN,