batchtx: add self chan balance to channel output

Because the self channel balance is added to the total leased amount and
pushed to the taker by the maker, we also need to add it to the actual
funding output.

venue/batchtx/tx.go

@@ -518,9 +518,12 @@ func (e *ExecutionContext) assembleBatchTx(orderBatch *matching.OrderBatch,
 		orderDetails := matchedOrder.Details
 		bid := orderDetails.Bid
 		ask := orderDetails.Ask
+
+		fundingAmount := orderDetails.Quote.TotalSatsCleared +
+			bid.SelfChanBalance
 		_, fundingOutput, err := input.GenFundingPkScript(
 			bid.MultiSigKey[:], ask.MultiSigKey[:],
-			int64(orderDetails.Quote.TotalSatsCleared),
+			int64(fundingAmount),
 		)
 		if err != nil {
 			return err