stderr ignore broken in 8.2.1

8.1.9:

```
$ bun repl            
> import {$} from 'zx'
> (await $`>&2 echo error`.stdio('inherit', 'pipe', 'ignore').quiet()).toString()
''
```

8.2.1:

```
$ bun repl            
> import {$} from 'zx'
> (await $`>&2 echo error`.stdio('inherit', 'pipe', 'ignore').quiet()).toString()
'error\n'
```

