Include mod_accesslog with new config

[PromoFaux]

What does this PR aim to accomplish?:

Prevents the following from occuring in the error log on fresh installs on debian-based distros (and by extension docker builds)

2023-01-16 10:20:01: configfile.c.1142) WARNING: unknown config-key: accesslog.filename (ignored)
2023-01-16 10:20:01: configfile.c.1142) WARNING: unknown config-key: accesslog.format (ignored)

This does not occur on upgrades because in those cases the old lighttpd.conf that we provided is not overwritten

pi-hole/docker-pi-hole#1273

Fedora/centos are unaffected

This could be fixed by running lighttpd-enable-mod accesslog in the docker container build script, but it is bound to show up here eventually.

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[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-web-v5-18-2-and-core-v5-15-1-released/60695/1