netann: update ChanAnn2 validation to work for P2WSH channels

This commit expands the ChannelAnnouncement2 validation for the case
where it is announcing a P2WSH channel.

server.go

@@ -1063,7 +1063,7 @@ func newServer(ctx context.Context, cfg *Config, listenAddrs []net.Addr,
 		Graph:                 s.graphBuilder,
 		ChainIO:               s.cc.ChainIO,
 		Notifier:              s.cc.ChainNotifier,
-		ChainHash:             *s.cfg.ActiveNetParams.GenesisHash,
+		ChainParams:           s.cfg.ActiveNetParams.Params,
 		Broadcast:             s.BroadcastMessage,
 		ChanSeries:            chanSeries,
 		NotifyWhenOnline:      s.NotifyWhenOnline,