fix: prevent double response logging in prerender

[Rich-Harris]

tiny fix which should have been part of #16374 — we don't need to log responses multiple times. will self-merge once green

[pkg-svelte-dev]

Install the latest version of @sveltejs/kit from 63c12f9:

pnpm add https://pkg.svelte.dev/@sveltejs/kit/c/63c12f9d984f4fdbb3609baf12162b529b608f1d

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/kit/pr/16429

[changeset-bot]

⚠️ No Changeset found

Latest commit: 63c12f9

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-kit-16429-svelte.vercel.app/