fix: handle p.quote-inline class in content parsing

[shuuji3]

Mastodon prepends the "RE: https://..." string in quote post for the compatibility purpose. This PR adjust the existing parser to allow p.quote-inline element and hides it.

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[shuuji3]

confirmed the fix!

[cheeaun]

I think it should only be hidden if there's a native quote.

[shuuji3]

Good point.😅 My assumption was class="quote-inline" is only added to <p>RE: ...</p> element, just based on my observation that only Matsodon v4.5 add class="quote-inline" but Mastodon v4.4 doesn't (not sure if there's documentation). But I think checking that can prevent hiding it unintentionally.