fix: RPL_MONONLINE must be server-prefixed
fix: RPL_MONONLINE must be server-prefixed

also, remove the self-notification check; clients are probably not
monitoring themselves, and it doesn't much matter if they are

oragono/oragono,oragono/oragono,DanielOaks/oragono,DanielOaks/oragono,oragono/oragono