Bug: postRenderers broken

This MR introduced a bug with post renderers.

It can be reproduced by running helm template chart -f renderers.yaml where renderers.yaml:

addons:
  harbor:
    enabled: true
    postRenderers:
      - kustomize:
          patches:
            - target:
                groups: apps
                version: v1
                kind: Deployment
                name: harbor-core
              patch: |
                - op: replace
                  path: "/spec/template/spec/containers/0/livenessProbe/timeoutSeconds"
                  value: 3

Current Output:

Error: YAML parse error on bigbang/templates/harbor/helmrelease.yaml: error converting YAML to JSON: yaml: line 67: did not find expected key

Use --debug flag to render out invalid YAML

Suggestion:

If both of these nindents were the same, i.e. both 2 or both 4, the template works.

Raised by @marclehner and @jbelleza