lnd: update invoiceRegistry to match new switch requirements

witness_beacon.go

@@ -73,7 +73,7 @@ func (p *preimageBeacon) LookupPreimage(payHash []byte) ([]byte, bool) {
 	// the preimage as it's on that we created ourselves.
 	var invoiceKey chainhash.Hash
 	copy(invoiceKey[:], payHash)
-	invoice, err := p.invoices.LookupInvoice(invoiceKey)
+	invoice, _, err := p.invoices.LookupInvoice(invoiceKey)
 	switch {
 	case err == channeldb.ErrInvoiceNotFound:
 		// If we get this error, then it simply means that this invoice