Fixed $python_chocolatey value: string to boolean

`$python_chocolatey` should be a boolean value, otherwise the user could wrongly set this value to the string `'false'` and the comparison in init.pp: `if $python_chocolatey {` would return True.

If for some reason we want to keep it as a string, we should use something like `if $python_chocolatey == 'true'`.