HPCC-9635 - Ensure LIMIT rowLimit member is initialized

rowLimit was not initialized until start()
getMetaInfo can be called before start, which would have
led to the wrong totalRowsMax being set

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #4608 from jakesmith/hpcc-9635

HPCC-9635 - Ensure LIMIT rowLimit member is initialized

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>