HPCC-10006 Stop compound aggregation of CHOOSEN with start count

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #4919 from ghalliday/issue10006

HPCC-10006 Stop compound aggregation of CHOOSEN with start count

Reviewed-By: Jamie Noss <james.noss@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>