fix(hooks-web): fix duplicated key in <CurrentRefinements>

[francoischalifour]

When you use multiple <Index> widgets with widgets with the same attribute, and then refine both these widgets, the <CurrentRefinements> displays a React key warning because the keys are identical.

This adds the index name to the label key to have unique keys.

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[Haroenv]

with a transformItems I think there could be other reasons to end up with a double label, but that's less likely to be on purpose. LGTM!

Looks like InstantSearch.js is also susceptible to the same warning: https://github.com/algolia/instantsearch.js/blob/master/src/components/CurrentRefinements/CurrentRefinements.tsx#L20-L29

[francoischalifour]

@Haroenv In InstantSearch.js, we do prefix it with the index name: https://github.com/algolia/instantsearch.js/blob/80ca07e29064357343ee997be94ef10beadba637/src/components/CurrentRefinements/CurrentRefinements.tsx?rgh-link-date=2022-06-13T08%3A24%3A33Z#L45

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