Don't overwrite letsencrypt.sh on DA update

Version 1.54

Bugfix
Finished

Related to thread: https://forum.directadmin.com/showthread.php?t=56834 The letsencrypt.sh has a copy stored in the update.tar.gz pack. I've removed the script from the update.tar.gz, so custombuild will be 100% in control of the initial install. No changes are needed to enable LetsEncrypt: https://help.directadmin.com/item.php?id=648

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