HPCC-11876 Roxie not updating wu result info after diskwrite

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6201 from richardkchapman/roxie-write-details

HPCC-11876 Roxie not updating wu result info after diskwrite

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>