fix(create-app): update svelte templates to use named export of vite-…

[dominikg]

…plugin-svelte

Description

Starting with version 1.0.0-next.11, @sveltejs/vite-plugin-svelte is going to use a named export 'svelte' instead of a default export for the plugin function. This PR is in preparation for that and should be merged after 1.0.0-next.11 has been released

update: vite-plugin-svelte@1.0.0-next.11 has been released this PR is ready to be merged

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.