HPCC-10347 ECL Watch "Open in New Window" fails

Open in new window would include "Widget=" twice if the called from a "Open in
New Window" session.

Fixes HPCC-10347

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #5089 from GordonSmith/HPCC-10347

HPCC-10347 ECL Watch "Open in New Window" fails

Reviewed-By: Miguel Vazquez <miguel.vazquez@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>