fix: remove loaded input sourcemap (fixes #8411)

[sapphi-red]

Description

fixes #8411

Also fixes the weird behavior with @vite/client. @vite/client had two sourceMappingURL.

export {ErrorOverlay, createHotContext, injectQuery, removeStyle, updateStyle};
//# sourceMappingURL=client.mjs.map

//# sourceMappingURL=data:application/json;base64,foobar

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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