pass all of server.js data from root layout

[AlecAivazis]

Fixes #544

This PR fixes an issue introduced in #542 that hid the data returned from +layout.server.js

To help everyone out, please make sure your PR does the following:

• Update the first line to point to the ticket that this PR fixes
• Add a message that clearly describes the fix
• If applicable, add a test that would fail without this fix
  • this is tricky because we also want a test that we are able to fake the file if it doesn't exist. I'm opting to leave things how they are now since the changes are pretty clear
• Make sure the unit and integration tests pass locally with pnpm run tests and cd integration && pnpm run tests
• Includes a changeset if your fix affects the user with pnpm changeset

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Name	Status	Preview	Updated
docs	✅ Ready (Inspect)	Visit Preview	Sep 15, 2022 at 5:25PM (UTC)
docs-next	✅ Ready (Inspect)	Visit Preview	Sep 15, 2022 at 5:25PM (UTC)

[changeset-bot]

🦋 Changeset detected

Latest commit: 335aaf2

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