server+htlcswitch: check waiting-close fwdpkgs in reforwardResponses

Previously, the Switch would not check waiting-close channels' fwdpkgs
for settles or fails to reforward. This could result in a force close
in a rare edge case if a restart occurred at the wrong time. Now,
waiting-close fwdpkgs are checked and the issue is avoided.

server.go

@@ -630,6 +630,7 @@ func newServer(cfg *Config, listenAddrs []net.Addr,
 	s.htlcSwitch, err = htlcswitch.New(htlcswitch.Config{
 		DB:                   dbs.ChanStateDB,
 		FetchAllOpenChannels: s.chanStateDB.FetchAllOpenChannels,
+		FetchAllChannels:     s.chanStateDB.FetchAllChannels,
 		FetchClosedChannels:  s.chanStateDB.FetchClosedChannels,
 		LocalChannelClose: func(pubKey []byte,
 			request *htlcswitch.ChanClose) {