fix: update ModuleOptions interface in module.ts

[productdevbook]

gives an error for these, but they are not required fields.

https://github.com/nuxt-modules/google-fonts/blob/dbd45b4713335840d4ad9ab66b3cfa352ec8e7f1/src/module.ts#L39-L43

[netlify[bot]]

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[ricardogobbosouza]

Thanks @productdevbook