fix(uni-builder): no need to set html-webpack-plugin

[9aoy]

Summary

rsbuild already use html-webpack-plugin by default in webpack mode.

web-infra-dev/rsbuild#4175

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Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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⚠️ No Changeset found

Latest commit: 32772eb

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