`makoctl menu` parses menu program's flags as its own

As of version 1.10.0, `makoctl menu` appears to incorrectly parse flags passed as part of the menu-item selection program as if they were intended for `makoctl` itself. Even an example taken directly from the manpage exhibits this:
```
❯ makoctl menu dmenu -p 'Select Action: '
menu: invalid option -- 'p'
```

I'm going to assume this is a relatively straightforward parsing issue, but am happy to provide further testing if needed!