Fix ingress' service backend templating

[kang-makes]

Ingress service is not using the withSuffix stanza, hence templating incorrectly compared with the service name.

Ingress was correctly deployed and its status is healthy because the ingress controller set the status, but there are not endpoints:

Labels:           app.kubernetes.io/instance=kang
                  app.kubernetes.io/managed-by=Helm
                  app.kubernetes.io/name=stateless-dns
                  argocd.argoproj.io/instance=kang-dns
                  helm.sh/chart=stateless-dns-0.2.3
Namespace:        k-dns
Address:          46.4.181.74
Ingress Class:    kang
Default backend:  <default>
TLS:
  pdns-certs terminates pdns-api.kangmak.es
Rules:
  Host                 Path  Backends
  ----                 ----  --------
  pdns-api.kangmak.es
                       /   kang-stateless-dns:80 (<error: endpoints "kang-stateless-dns" not found>)
Annotations:           cert-manager.io/cluster-issuer: letsencrypt-prod-kang
                       nginx.ingress.kubernetes.io/auth-tls-secret: cert-manager/kang-ca
                       nginx.ingress.kubernetes.io/auth-tls-verify-client: on
Events:                <none>

[nadiamoe]

LGTM