fix: Preload in lib template

[elliott-with-the-longest-name-on-github]

Closes #9859

I couldn't immediately think of a reason we weren't doing this, so I just went ahead and added it. If there's a legit issue with adding it, we can just close this and the associated issue.

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with pnpm test and lint the project with pnpm lint and pnpm check

Changesets

• If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

[changeset-bot]

🦋 Changeset detected

Latest commit: 684bacd

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
create-svelte	Minor

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[benmccann]

it seems a bit aggressive to me as it creates more load on the server. I personally like the current default of opting into it

[dummdidumm]

We current default makes for faster pages, "falling into the pit of success" etc - it's also consistent with the other templates that way