HPCC-9687 Ambiguous xpath error from EclWatch displaying Roxie queries

If a query is in more than one packageset, can get an ambiguous xpath error
when checking the information for whether query is suspended.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4637 from richardkchapman/ambiguous-xpath

HPCC-9687 Ambiguous xpath error from EclWatch displaying Roxie queries

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>