fix(transformer-attributify-jsx): ignore the className part

[Flower-F]

When I tried to use the UnoCSS in a React project today, I found a bug of the transformer-attributify-jsx. The transformer-attributify-jsx will change the attribute to xxx="", such as text-red="", to avoid the limitation of React JSX. But it also changes the className part by mistake. For example, I might write some code snippet like this:

<div className={red ? 'text-red' : 'text-green' }></div>

But it would be transformed to something like this:

<div className={red ? 'text-red=""' : 'text-green=""' }></div>

So I can't get the correct result. And this PR is to solve this problem, as it will ignore the className part when transforming jsx.

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[SnowingFox]

nice