ipv6_conn_bi_direct_write does not show up in parsed extra-info descriptor

We use the read value twice instead:

      preparedStatement.setLong(55, desc.getIpv6ConnBiDirectBelow());
      preparedStatement.setLong(56, desc.getIpv6ConnBiDirectRead());
      preparedStatement.setLong(57, desc.getIpv6ConnBiDirectRead());
      preparedStatement.setLong(58, desc.getIpv6ConnBiDirectBoth());