fix(fileuploaderitem): allow configurable className

[tay1orjones]

Surfaced in slack. For some reason className wasn't being applied in the cx() call, instead relying on the prop spread on the span. So if you passed in a className, all the built in classes wouldn't be applied.

Here's a repro of the bug: https://stackblitz.com/edit/github-svhol5?file=src%2FApp.jsx

Is this intentional? I can't find a related PR or anything, but maybe I missed something 🤔

Changelog

Changed

• use className in addition to the internal classnames

Testing / Reviewing

• If you pass in a className, the default styles should still be applied.

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[alisonjoseph]

Oh weird, definitely seems like a bug and not intentional. 👍