Potentially dry-run not being detected.

[roperto]

Detected in #64 probably same problem as #65

See https://github.com/abias/moodle-local_datacleaner/blob/master/cli/lib.php#L70

Check if calling function is sending $options or $options['dryrun'];

[roperto]

When checking this issue, it is worth checking other subplugins using it.