fix(plugin-shiki): no code title

[SoonIter]

Summary

introduced in #2046

should add it back

Related Issue

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Timeless0911]

BTW, does defaultWrapCode config work for shiki now?

[SoonIter]

defaultWrapCode

rspress/packages/theme-default/src/layout/DocLayout/docComponents/code/CodeButtonGroup.tsx

Lines 16 to 17 in 6bdd614

	const [codeWrap, setCodeWrap] = useState(defaultWrapCode);