fix: initWasm options should be optional

[btea]

Description

The importObject parameter is optional.

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the PR Title Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
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[sapphi-red]

Thanks!

vite/packages/vite/src/node/plugins/wasm.ts

Lines 71 to 72 in bd9b749

	import initWasm from "${wasmHelperId}"
	export default opts => initWasm(opts, ${JSON.stringify(url)})

vite/packages/vite/src/node/plugins/wasm.ts

Line 7 in bd9b749

const wasmHelper = async (opts = {}, url: string) => {