Revert "fix: make SharedProps compatible with inertia usePage"

[Julien-R44]

This PR broke InferPageProps. For example :

export default function Home(props: InferPageProps<TestsController, 'login'>) {
  props
  // ^? { [x: string]: never; [x: number]: never; }
}

props will always be equal to { [x: string]: never; [x: number]: never; } no matter what we do.

cc @Barabasbalazs

[Barabasbalazs]

@Julien-R44 thanks for the heads up. I will look into it!