Paraglide: Fix typing for newLanguage in demo code

[msgeissler]

The paraglide demo contains sample code for a language switcher with typing in JSDoc.

Currently the typing is not working, as it is missing curly brackets.

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[manuel3108]

Thanks!

[Rich-Harris]

preview: https://svelte-dev-git-preview-cli-337-svelte.vercel.app/

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commit: e3257eb