HPCC-11497 Fix spurious notify on parent changes

If a parent path of a subscriber was commited to, the subscribers
were spuriously notified.

Signed-off-by: Jake Smith <jake.smith@lexisnexis.com>
Merge pull request #6002 from jakesmith/hpcc-11497

HPCC-11497 Fix spurious notify on parent changes

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>