HPCC-9075 Clean up unused Roxie configuration settings

There are a few settings in roxie.xsd that no longer have any effect.
Remove them.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4192 from richardkchapman/roxie-unused-options

HPCC-9075 Clean up unused Roxie configuration settings

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>