Bug 17669: Add new switch to crontab example and debian daily cron file

Bug 17669: Add new switch to crontab example and debian daily cron file

The new switch for deleting temporary uploads in cleanup_database can
be added to cron.

Note: Since the option --temp-uploads does only purge temporary uploads
when triggered by the preference Upload_PurgeTemporaryFiles_Days, it can
be safely added here.

Test plan:
There is actually nothing to test here if you followed the preceding test
plans. Just verify that the switch is inserted ocrrectly.

Signed-off-by: Mirko Tietgen <mirko@abunchofthings.net>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>