分账，付供应商运费bugfix

src/main/java/com/caimei/service/impl/PayOrderServiceImpl.java

@@ -581,7 +581,7 @@ public class PayOrderServiceImpl implements PayOrderService {
                     BigDecimal shipping = payOrderMapper.findShipping(order.getOrderId(), shopOrder.getShopId());
                     shopPostFee = MathUtil.sub(shopPostFee, shipping);
                     if (MathUtil.compare(splitAmount, shopPostFee) > -1) {
-                        splitAmount = MathUtil.sub(splitAmount, shipping);
+                        splitAmount = MathUtil.sub(splitAmount, shopPostFee);
                     } else {
                         shopPostFee = splitAmount;
                         splitAmount = BigDecimal.ZERO;