delete duplicate enable-vts-status

Created by: xyz-li

kustomize can not process charts with duplicate keys. So I delete this duplicate.

gitlab/values.yaml contains this key.

nginx-ingress:
  enabled: true
  tcpExternalConfig: "true"
  controller:
    image:
      repository: kubesphere/nginx-ingress-controller
      tag: 0.21.0
    config:
      hsts-include-subdomains: "false"
      server-name-hash-bucket-size: "256"
      enable-vts-status: "true"
      use-http2: "true"

/assign @zheng1