fix(utils): atomWithObservable is not resubscribed after remount

[11bit]

atomWithObservable seems to be not resubscribing to observable when a component is being hidden and then shown again.

There is a test reproducing it and also a codesandbox: atom value updates when clicking on a document, but if you hide/show component, it doesn't update anymore.

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[dai-shi]

Nice catch!!!
Thanks for the fix and the test!

[dai-shi]

@11bit Thanks for your contribution. If you are interested, would you like to contribute more? We need more contributors for atomWithObservable. See #875 for example.

[11bit]

@dai-shi sure. will have a look at the next week

[11bit]

@dai-shi I made PR #1058 that adds initialData (api is similar to #875 but different implementation). Please have a look