fix(js): fix panel placement after scrolling

[shortcuts]

Summary

Since #536, the panel wasn't well positioned after scrolling.

Results

Panel is positioned below the input, still fixes #535.
Closes #591

[codesandbox-ci]

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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
@algolia/autocomplete-example-starter-algolia	Configuration
@algolia/autocomplete-example-starter	Configuration
@algolia/autocomplete-example-voice-search	Configuration
@algolia/autocomplete-example-vue	Configuration
elastic-hermann-8mqy3	Issue #535
@algolia/autocomplete-example-query-suggestions-with-recent-searches	Issue #591

[francoischalifour]

Awesome, thank you!