force cwd-prefix to be on

[danielb2]

Ref: https://github.com/sharkdp/fd/issues/1243, https://github.com/sharkdp/fd/issues/1182, https://github.com/sharkdp/fd/issues/1046

I'm using fd with fzf and I want to be able to search from a relative path starting with ./

I've read several issues in regards to ./ and I think they would all be solved if we had two separate options

--strip-cwd-prefix
--show-cwd-prefix

instead of predicting defaults for different use-cases, this would allow anyone to override the behavior in either situation