[db] db_pl_delete_bypath() must also delete disabled playlists

Otherwise we end up with a bunch of disabled playlists in the db.

src/db.h

@@ -99,6 +99,8 @@ struct query_params {
 
   char *filter;
 
+  int with_disabled;
+
   /* Query results, filled in by query_start */
   int results;