Minor bug regarding non snake_case variables in strings

Thanks for fixing this! However I just found out there is still a minor bug regarding variables in strings:

![](https://i.imgur.com/yKRyRgv.png)

_Originally posted by @Zezombye in https://github.com/puppetlabs/puppet-editor-syntax/issues/52#issuecomment-611428981_