Remove the hosted rooms' old owner mapping

Hosted rooms' instance IDs start with their owner's IMVU account now, so the client asks about their
products as the owner itself, and the mapping from 2100000000 is never used.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

cmd/t5de-proxy/main.go

@@ -156,7 +156,6 @@ func run(logger *log.Logger, listen, ready string, parentPID int, trace bool, pa
 	if prods != nil {
 		prods.Hosted = rooms
 		rooms.User, rooms.LocalProduct, rooms.GlobalProduct = prods.User, prods.LocalID, prods.ProductID
-		prods.HostedOwner = rooms.Owner
 		rooms.UserDeliver = prods.DeliverToUser
 		rooms.Deliver = func(c *proxy.IMQConn, m imq.Delivered) {
 			m.Message = prods.Incoming(c, m)