sweep: use bbolt DB directly instead of channeldb

server.go

@@ -764,7 +764,7 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB,
 		sweep.DefaultBatchWindowDuration)
 
 	sweeperStore, err := sweep.NewSweeperStore(
-		chanDB, activeNetParams.GenesisHash,
+		chanDB.DB, activeNetParams.GenesisHash,
 	)
 	if err != nil {
 		srvrLog.Errorf("unable to create sweeper store: %v", err)