Fixes workdir lowercasing.
The cli.ask command would forcibly lowercase the whole string. This
made the script unusable on a non-FHS-compliant system, like mine, where
the users's directories are under /Users/.
I'm using a scheme non-compliant with the FHS for my home folder, it is un /Users/$USER. It's really good to sniff out bugs where software assumes /home/. Surprisingly, the first time such an issue happened to me.
In a more perverse way, it will affect FHS-compliant /home/ users that will want to input a workdir using uppercase letters (e.g. /home/bob/TEMP/pmbootstrap), where it will disregard uppercasing.