HPCC-10391 - Set default XREF period to 28 days

Used to be default 0 (disabled)

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #5706 from jakesmith/hpcc-10391

HPCC-10391 - Set default XREF period to 28 days

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>