Values: Remove configmap keys matching defaults.

[Gacko]

This PR removes those keys from configmap which already match their default documented in here.

Tests on workload clusters (not always required)

For changes in the chart, chart templates, and ingress controller container images, I executed the following tests
to verify them working in live enviromnents:

Test / Provider	AWS	Azure	KVM
Upgrade from previous version	✓	✓
Existing Ingress resources are reconciled correctly	✓	✓
Fresh install	✓	✓
Fresh Ingress resources are reconciled correctly	✓	✓

Testing was done using hello-world-app.

Hint for KVM:

kubectl port-forward -n kube-system svc/nginx-ingress-controller-app 8080:80
ingress_domain=host.configured.in.ingress; curl --connect-to "$ingress_domain:80:127.0.0.1:8080" "http://$ingress_domain" -v

[Gacko]

At first I felt brave enough to also remove configmap.hsts, but the amount of issues in the past changed my mind. Not sure how to proceed on this... I'd like to move all the configmap.* stuff to controller.config in the future.