Fix bug reported by access_d: was routing mail (when using a FLO mailer) even

when the destination node was configured for "Direct". Apparently others have
been working around this issue with a "Route to" configuration directive to
route a node's netmail to itself. This work-around should no longer be
necessary, but anyone that was depending on the old behavior (routing mail
for nodes configured as "Direct") will need to adjust their configuration.