rendezvous: fix misleading log message
rendezvous: fix misleading log message

We only log the internal (sqlite) ID of the nameplate, not the actual
small-integer name. While investigating misbehavior due to overload, I was
confused into thinking that users were getting nameplates in the 15000+
range, when in fact those were merely the internal database row ids.

warner/magic-wormhole,warner/magic-wormhole,warner/magic-wormhole,warner/magic-wormhole