register-unsafely-without-email config key is kept when turning unsafe_registration back to false

[neomilium]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet: 6/7
• Distribution: Tested on Debian, all affected
• Module version: 8.0.2

How to reproduce (e.g Puppet code you use)

First, apply a simple catalog using unsafe_registration sets to true

class { 'letsencrypt':
  unsafe_registration => true,
}

Next apply a catalog using unsafe_registration sets to false

class { 'letsencrypt':
  email => 'hello@example.com',
}

What are you seeing

register-unsafely-without-email is set to true in config file.

What behaviour did you expect instead

No register-unsafely-without-email in config file, or set to false.

Any additional information you'd like to impart

PR is coming…