`useLocalStorage` not updating if many components watch the same key

## Description

Hey! Thanks for the awesome project. I’m having a problem where multiple calls to `useLocalStorage('my-key')` from different components are not staying in sync as the value changes.

## Reproduction

I’ve reproduced it in this sandbox:

https://codesandbox.io/s/distracted-bash-x9k10?file=/pages/index.js

## Expected behavior

If my `localStorage` value changes, all my components watching that value pick up the change.

## Actual behavior

The hook seems to be initializing from `localStorage` into individual instances of `useState` and then never reading from `localStorage` again.

Start with the linked CodeSandbox reproduction, especially pages/index.js, and inspect the useLocalStorage hook implementation in the repository. Confirm how separate hook instances respond when the shared localStorage key changes; done means all components watching the key update consistently.

Written by the indexing model from the issue text.