Bug 6810: [QA Follow-up] Some minor tidying up of cron script

Bug 6810: [QA Follow-up] Some minor tidying up of cron script

Moved some POD lines and removed some duplicated POD lines.
Corrected some indentation.
Did some minor spelling changes, rewording.
Removed the C4::Dates module. No longer needed.
Removed a label in front of the for statement.
Removed the Do you wish to continue-code. Should not be in a cron job.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>