CDDB: display CDDB ID in the right format

Aka a 8 digit hexa number, as used in search engines like
http://www.freedb.org/freedb_discid_check.php

Ref #4370

modules/access/cdda.c

@@ -397,7 +397,7 @@ static int GetTracks( access_t *p_access, input_item_t *p_current )
     cddb_disc_t *p_disc = GetCDDBInfo( p_access, i_titles, p_sys->p_sectors );
     if( p_disc )
     {
-        msg_Dbg( p_access, "Disc ID: %u", cddb_disc_get_discid( p_disc ) );
+        msg_Dbg( p_access, "Disc ID: %08x", cddb_disc_get_discid( p_disc ) );
         psz_album = cddb_disc_get_title( p_disc );
         psz_genre = cddb_disc_get_genre( p_disc );