Remove ON CONFLICT from insert into stories_tags_map
Remove ON CONFLICT from insert into stories_tags_map

stories_tags_map_partition_by_stories_id_insert_trigger trigger
essentially functions as an upsert and will resolve the conflicts
itself.

berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud,berkmancenter/mediacloud