Multiline class output fix

[funny-family]

🤔 What is the nature of this change?

• New feature
• Fix bug
• Style optimization
• Code style optimization
• Performance optimization
• Build optimization
• Refactor code or style
• Test related
• Other

🔗 Related Issue

💡 Background or solution

📝 Changelog

Language	Changelog
🇺🇸 English	Fix multi line class output. Close issue: #569
🇨🇳 Chinese

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[funny-family]

@Amour1688 cc

[sxzz]

const App = () => (
  <div
    hello="a  b"
  >
    Hello World
  </div>
)

It should be hello: "a b"

[sxzz]

I think we can use the same logic in transformJSXText from utils.ts.

[sxzz]

But we can remove redundant spaces after \n. For example https://babeljs.io/repl#?browsers=&build=&builtIns=false&corejs=3.21&spec=false&loose=false&code_lz=MYewdgzgLgBAggBwTAvDAFASlQPgwKBhgB4ATASwDdCiYALAUwBsmQUAiAQxqICN2aAehz5MQA&debug=false&forceAllTransforms=false&modules=false&shippedProposals=false&circleciRepo=&evaluate=false&fileSize=false&timeTravel=false&sourceType=module&lineWrap=false&presets=react&prettier=false&targets=&version=7.22.5&externalPlugins=&assumptions=%7B%7D

[sxzz]

Thanks for the PR. We can directly use transformJSXText function 8ed497d