[gnome-control-center] Build fix: Update grl_registry_load_plugin_by_id API change

[Olav Vitters <ovitters src gnome org>]

commit 54d0cef51f37cc155bc956c91918b772aaf550f6
Author: Olav Vitters <olav vitters nl>
Date:   Wed Dec 16 23:21:18 2015 +0100

    Build fix: Update grl_registry_load_plugin_by_id API change
    
    Grilo 0.3.0 renamed grl_registry_load_plugin_by_id to
    grl_registry_activate_plugin_by_id.

 panels/background/cc-background-grilo-miner.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/background/cc-background-grilo-miner.c b/panels/background/cc-background-grilo-miner.c
index 3fb183c..7202441 100644
--- a/panels/background/cc-background-grilo-miner.c
+++ b/panels/background/cc-background-grilo-miner.c
@@ -308,7 +308,7 @@ cc_background_grilo_miner_class_init (CcBackgroundGriloMinerClass *klass)
   registry = grl_registry_get_default ();
 
   error = NULL;
-  if (!grl_registry_load_plugin_by_id (registry, "grl-flickr", &error))
+  if (!grl_registry_activate_plugin_by_id (registry, "grl-flickr", &error))
     {
       g_warning ("%s", error->message);
       g_error_free (error);