fix: update volumes and volumes mounts indent

[gscho]

I was getting YAML parse error on actions-runner-controller/templates/deployment.yaml and when I investigated it seems the indent by values were off by 2.

These are the values I was testing with:

additionalVolumeMounts:
- mountPath: /etc/ssl/certs
  name: ghe-cert
  readOnly: true
additionalVolumes:
- name: ghe-cert
  secret:
    secretName: ghecert

Signed-off-by: Gregory Schofield gscho@github.com

[mumoshu]

Apparently, this has been introduced via #952. Thanks for fixing it @gscho!