HPCC-11058 LandingZone Deselection Fails

Fixes HPCC 11058

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5592 from GordonSmith/HPCC-11058_SelecteAllLZ

HPCC-11058 LandingZone Deselection Fails

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>