Unable to define default value for multiline

### Describe the problem

Tried: 

```
prompt = TTY::MyPrompt.new
res = prompt.multiline("Your description:", **{default: "My default description"})
# => Edit field without default value
```

Doesn't work with DSL neither.

### Environment

* OS version: MacOS 13.1
* Ruby version: 2.7.3p183
* TTY::Prompt version: 0.23.1

Thanks
