watchtower/wtclient: parameterize backup task with channel type

watchtower/wtclient/client_test.go

@@ -12,6 +12,7 @@ import (
 	"github.com/btcsuite/btcd/txscript"
 	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
+	"github.com/lightningnetwork/lnd/channeldb"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnwallet"
@@ -632,7 +633,7 @@ func (h *testHarness) backupState(id, i uint64, expErr error) {
 	_, retribution := h.channel(id).getState(i)
 
 	chanID := chanIDFromInt(id)
-	err := h.client.BackupState(&chanID, retribution, false)
+	err := h.client.BackupState(&chanID, retribution, channeldb.SingleFunderBit)
 	if err != expErr {
 		h.t.Fatalf("back error mismatch, want: %v, got: %v",
 			expErr, err)