HPCC-11575 Format RoxieTopology.xml consistently

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6043 from richardkchapman/roxie-topology-format

HPCC-11575 Format RoxieTopology.xml consistently

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>