routing: use distinct probability estimation for local channels

Previously we used the a priori probability also for our own untried
channels. This led to local channels that had seen a success already
being prioritized over untried local channels. In some cases, depending
on the configured payment attempt cost, this could lead to the payment
taking a two hop route while a direct payment was also possible.

server.go

@@ -672,6 +672,7 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB,
 			PenaltyHalfLife:       routingConfig.PenaltyHalfLife,
 			MaxMcHistory:          routingConfig.MaxMcHistory,
 			AprioriWeight:         routingConfig.AprioriWeight,
+			SelfNode:              selfNode.PubKeyBytes,
 		},
 	)
 	if err != nil {