fix: focus detached input on iOS (#653)

[salomvary]

Originally the focusing code was in a requestAnimationFrame to ensure it wasn't blocking other potentially more important browser work. However, this causes the input not to get focused on iOS, as the focus call isn't related to a user action anymore.

As the requestAnimationFrame doesn't have any real use case, removing it doesn't break any experiences, nor tests.

A test can be written by ensuring the input is immediately focused, not delayed in any way.

fixes #653

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Sandbox	Source
@algolia/autocomplete-example-github-repositories-custom-plugin	Configuration
@algolia/autocomplete-example-instantsearch	Configuration
@algolia/autocomplete-example-playground	Configuration
@algolia/autocomplete-example-preview-panel-in-modal	Configuration
@algolia/autocomplete-example-react-renderer	Configuration
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@algolia/autocomplete-example-starter	Configuration
@algolia/autocomplete-example-reshape	Configuration
@algolia/autocomplete-example-vue	Configuration
@algolia/autocomplete-example-playground	Issue #653

[Haroenv]

Thanks a lot, this PR is good to go for me

Tests, lint, bundlesize passes locally for me

[francoischalifour]

Awesome, thank you!

[dhayab]

Thanks for your contribution!