Issue title: [stable/lamp] Manually preparing the webroot and database fails
 Issue body: 
**Is this a request for help?**: I think so.

---

**Version of Helm and Kubernetes**: v1.13.4


**Which chart**: lamp


**What happened**:

As soon as i set init.manually.enabled to true i get:

`
Error: YAML parse error on lamp/templates/deployment.yaml: error converting YAML to JSON: yaml: line 50: did not find expected key
`

**What you expected to happen**:

Chart installs and i have a container for manually init.

Do I need to set another value?

thanks and cheers
 Comments: 
 Comment 0: This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Any further update will cause the issue/pull request to no longer be considered stale. Thank you for your contributions.

 Comment 1: This issue is being automatically closed due to inactivity.

 Comment 2: /reopen
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