With `onlyFiles: false` directories at the root are not included

With the following directory tree:
```
+-- test/
|   +-- dir
|       +-- file.js
```

```js
fg.sync('test/**', {onlyFiles: false});

// Result => ['test/dir/', 'test/dir/file.js']
// Should be => ['test', 'test/dir', 'test/dir/file.js']
```

For example with `node-glob`:
```js
glob.sync('test/**', {nodir: false});

// Result => ['test', 'test/dir', 'test/dir/file.js']
```