HPCC-12704 Set measure filter in StatisticsFilter::set()

Existing StatisticsFilter::set() does not set measure filter
by input: _measureText.

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
Merge pull request #6729 from wangkx/h12704

HPCC-12704 Set measure filter in StatisticsFilter::set()

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>