adopt single port defaults in ingress examples

Blocked by: https://github.com/openziti/ziti/pull/2497

Update the ingress examples to use single port/single ingress defaults.

- [Controller ingress example](https://github.com/openziti/helm-charts/blob/main/charts/ziti-controller/values-ingress-nginx.yaml)
- [Router ingress example](https://github.com/openziti/helm-charts/blob/main/charts/ziti-router/values-ingress-nginx.yaml)