funding+server: update switch after sending channel update

With this commit we give the funding manager the ability to inform the
switch about custom channel policies, right after we've announced the
channel to the network.
This change is necessary because before #6753 a channel could only be
opened with the default forwarding policies, so the switch automatically
had the "correct" default values. Since #6753 added the ability to
specify forwarding policies at channel open time, we announced those
policies to the network but never updated the switch to inform it about
the changed policies (previously changing the policies was only possible
through the UpdateChannelPolicy RPC which did call the switch).

server.go

@@ -1439,8 +1439,9 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 		RegisteredChains:              cfg.registeredChains,
 		MaxAnchorsCommitFeeRate: chainfee.SatPerKVByte(
 			s.cfg.MaxCommitFeeRateAnchors * 1000).FeePerKWeight(),
-		DeleteAliasEdge: deleteAliasEdge,
-		AliasManager:    s.aliasMgr,
+		DeleteAliasEdge:          deleteAliasEdge,
+		AliasManager:             s.aliasMgr,
+		UpdateForwardingPolicies: s.htlcSwitch.UpdateForwardingPolicies,
 	})
 	if err != nil {
 		return nil, err