HPCC-11753 Backmerge of control:queries speedup broke formatting

Make sure we don't use multiple lines in control:queries return.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6103 from richardkchapman/roxie-merge-queries-formatting

HPCC-11753 Backmerge of control:queries speedup broke formatting

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>