Detect non-standard lighttpd port during update

I run lighttpd for pihole admin on a non-standard port (eg. 8080). Every time I update pihole with "pihole -up" it resets the server.port configuration setting in /etc/lighttpd/lighttpd.conf to use port 80, which means that the service won't restart and I have to go and manually update the lighttpd config.

Since pihole updates are frequent, it'd be really nice if the update process could detect whether lighttpd is running on a port other than 80 and NOT change the server.port setting if so.

Sounds reasonable. Thanks for the submission.

See this PR for an upcoming fix.

This was implemented in 2.1 Web.