HPCC-11453 WsEcl shouldn't use ptr_noroot

Now that createPTreeFromXMLString supports ptr_noroot, it's become apparent that WsEcl shouldn't be setting it

Signed-off-by: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Merge pull request #5894 from afishbeck/norootRegression

HPCC-11453 WsEcl shouldn't use ptr_noroot

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>