HPCC-9854 Enable prototyping in JSBin

Fixes HPCC-9854

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #4740 from GordonSmith/HPCC-9854

HPCC-9854 Enable prototyping in JSBin

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>