HPCC-12100 ECL Watch Build Error (IE8 trailing comma)

Fixes HPCC-12100

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #6351 from GordonSmith/HPCC-12100

HPCC-12100 ECL Watch Build Error (IE8 trailing comma)

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>