Typing wrong for windows.py

I think the return type should be `Optional[Path]`, right?

```
    @property
    def quick_launch_location(self) -> Path:
        if self.mode == "system":
            # TODO: Check if this is true?
            warnings.warn("Quick launch menus are not available for system level installs")
            return
        return Path(windows_folder_path(self.mode, False, "quicklaunch"))
```