webHttp is used for both port and FTL configuration

[craigcabrey]

webHttp is used to configure two things at once:

1. Container port (https://github.com/MoJo2600/pihole-kubernetes/blob/main/charts/pihole/templates/deployment.yaml#L215-L217)
2. Environment variable (https://github.com/MoJo2600/pihole-kubernetes/blob/main/charts/pihole/templates/deployment.yaml#L159-L160)

The problem with this is that the env overrides whatever is in the config. And I can't change webHttp to the proper value (80,[::]:80), since it's not a valid port.

This value is necessary for IPv6 to work (otherwise I have to disable the probes), from the docs:

In order to use port 80 for all interfaces, both IPv4 and IPv6, use either the configuration "80,[::]:80"