router: fix 'out of order block error' by retrieving missing blocks in router

Fixes an issue where an out of order block error occurs in the router. When this occurs, the change uses the chain notifier to catch up on missed blocks and uses those blocks to fully update the routing graph with closed channels. Fixes #4710, #5132

server.go

@@ -781,6 +781,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 		Graph:               chanGraph,
 		Chain:               cc.ChainIO,
 		ChainView:           cc.ChainView,
+		Notifier:            cc.ChainNotifier,
 		Payer:               s.htlcSwitch,
 		Control:             s.controlTower,
 		MissionControl:      s.missionControl,