update_rss_feed: fix proper typecasting of mark_unread_on_update/update_on_checksum_change
update_rss_feed: fix proper typecasting of mark_unread_on_update/update_on_checksum_change

shakaran/Big-Big-RSS,shakaran/Big-Big-RSS,shakaran/Big-Big-RSS,shakaran/Big-Big-RSS,shakaran/Big-Big-RSS