multi: modify listtxn definition

This commit modifies listtransactiondetails method definition to
take in additional params: index_offset and maxTxn

lntest/mock/walletcontroller.go

@@ -187,7 +187,7 @@ func (w *WalletController) ListUnspentWitness(int32, int32,
 
 // ListTransactionDetails currently returns dummy values.
 func (w *WalletController) ListTransactionDetails(int32, int32,
-	string) ([]*lnwallet.TransactionDetail, error) {
+	string, uint32, uint32) ([]*lnwallet.TransactionDetail, error) {
 
 	return nil, nil
 }