core: Correct XML namespace for author & artist

We were using dc: for some reason, but it*s upnp:

diff --git a/src/rygel/rygel-media-objects.vala b/src/rygel/rygel-media-objects.vala
index 9cf657c..e91316c 100644 (file)
--- a/src/rygel/rygel-media-objects.vala
+++ b/src/rygel/rygel-media-objects.vala
@@ -28,7 +28,7 @@ using GUPnP;
  */
 public class Rygel.MediaObjects : ArrayList<MediaObject> {
     public const string SORT_CAPS = "@id,@parentID,dc:title,upnp:class," +
-                                    "dc:artist,dc:author,upnp:album," +
+                                    "upnp:artist,upnp:author,upnp:album," +
                                     "dc:date,upnp:originalTrackNumber";
 
     public override Gee.List<MediaObject>? slice (int start, int stop) {