Windows: if cwd is a symlink, lsd only shows "." in output

If the current Windows working directory is a symlink, lsd only shows "." as output instead of listing the target directory. Works as expected on Linux.

```
C:\ $ lsd -l
.....
lrwx------ REEF\vladimir REEF\None 0 B Fri Dec 14 14:35:27 2018  proj ⇒ d:\proj
.....
C:\ $ cd proj
C:\proj $ lsd
 .
```

Start by reproducing the issue on Windows with a symlinked current directory and compare `lsd -l` with `lsd` from the example. Trace the current-directory and symlink handling until the target directory listing is identified; done means `lsd` lists the target contents instead of only `.`.

Written by the indexing model from the issue text.