fix: correctly type form remote functions that do not accept data

[teemingc]

fixes #14570

One of the overloads for the form remote function was missing a MaybePromise for the function return type. This PR fixes that.

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Latest commit: ef05177

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@sveltejs/kit	Patch

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Preview: https://svelte-dev-git-preview-kit-14573-svelte.vercel.app/