Cleanup: Remove builtin-wasm-modules from autogates passed to workerd

[dom96]

The builtin-wasm-modules autogate is no longer required.

What this PR solves / how to test

Doesn't fix anything. Just a cleanup.

Author has addressed the following

• Tests
  • TODO (before merge)
  • Included
  • Not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required / Maybe required
  • Not required because:
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Included
  • Not necessary because: cleanup
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s): https://github.com/cloudflare/cloudflare-docs/pull/...
  • Not necessary because: trivial cleanup

[changeset-bot]

⚠️ No Changeset found

Latest commit: d6e89d7

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