HPCC-10667 New ECL Watch Deselection broken

Deselected items would still show up in selections.
Deleted items would still be in selection list.

Fixes HPCC-10667

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5379 from GordonSmith/HPCC-10667

HPCC-10667 New ECL Watch Deselection broken

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>