lsd does not exit on closed pipes

- os:
- `lsd --version`: lsd 0.21.0
- `echo $TERM`: xterm-256color
- `echo $LS_COLORS`:
```
zsh: correct '$LS_COLORS' to '$LSCOLORS' [nyae]? y
Gxfxcxdxbxegedabagacad
```

## Expected behavior
When piping to a program that exist, `lsd` will continue running until reading (all) paths is done. This is a problem when using the recursive flag, as `lsd` will recurse all directories than exit.

```bash
lsd -lR / | bash -c 'exit'
```: This command will go on until all paths are consumed, which takes a lot of time and memory.

```bash
/bin/ls -lR / | bash -c 'exit'
```: This command exits in less than a second.

## Actual behavior
Noted above

Reproduce the issue with `lsd -lR / | bash -c 'exit'` and compare its termination with `/bin/ls -lR / | bash -c 'exit'`. Trace the Rust CLI's handling of output and closed pipes; done means lsd stops promptly when the downstream program exits, including recursive listings.

Written by the indexing model from the issue text.