HPCC-10425 New regression suite diff report is backwards

Fix diff sequnce.

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #5146 from AttilaVamos/HPCC-10425-fix

HPCC-10425 New regression suite diff report is backwards

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>