Do not force nameserver 127.0.0.1 through resolvconf

[DL6ER]

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What does this PR aim to accomplish?:

This is a proposed bug fix for #2535 and maybe a few others. As this is a breaking change, we might want to include it in v5.0 ?...

How does this PR accomplish the above?:

Remove calls to resolvconf within pihole-FTL's init.d script.

What documentation changes (if any) are needed to support this PR?:

Probably none.

[pralor-bot]

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

https://discourse.pi-hole.net/t/pihole-update-failure/27576/3