NGINX reconfigures to 853 but doesn't leave port 80 for cert renewal

[ssign]

Describe the issue
When you run the script, NGINX starts as port 80 for the cert download, but once the script completes it only is active on port 853. Port 80 needs to remain in order to do the 3 month Lets Encrypt cert renewal.

To Reproduce
Run the script and check 'sudo netstat -tupan` and you'll see only 853 being openby NGINX

Expected behavior
NGINX should run as both 853 and 80, or be able to flip back and forth for the 3 month cert renewal.. I think. :)

Desktop (please complete the following information):

• OS: Raspberry Pi Zero W2 running PiHole 5.15.32-v7+