HPCC-10370 Resubmit workunit uses the original user's id

Currently anyone with ws_workunit access can resubmit anyone else's workunits.
This fix verifies that, on a resubmit, the workunit owner is the same as
the resubmitter, and disallows it if not

Signed-off-by: William Whitehead <william.whitehead@lexisnexis.com>