Fix remaining orphan break by sweeping hidden inline token forcibly

[yhatt]

I've found that the sweep plugin does not handle the HTML breaks rendered when markdown-it's breaks option is enabled. markdown-it does not treat hidden flag for inline token.

![bg](https://github.com/yhatt.png)
![bg](https://github.com/marp-team.png)

# Hello

It causes by the behavior of markdown-it. The inline token is not treat hidden flag.

Marpit sweep plugin will rename the token type into unique name: marpit_hidden_inline. hidden: true becomes to work for unknown tokens, so we can sweep hidden inline token forcibly.