Query string stream sorting correction

The query string sorting expained at the [streams->cp->entries_table()](http://docs.pyrocms.com/2.2/manual/developers/tools/streams-api/cp-driver#entries_table\(stream_slug,namespace_slug,pagination:null,pagination_uri:null,view_override:false,extra:array\)) docs were not working. The direction was always ASC. This fix corrects it.