Navigating options should not scroll page

## Description

When navigating options in the combobox popup, the scroll position on the page should not change.

## Reproduction

**Steps**

1. Go to https://www.algolia.com/doc/ui-libraries/autocomplete/introduction/what-is-autocomplete/ and place cursor in the second combobox.
2. Press Down arrow key a couple of times and see scroll position change.

https://user-images.githubusercontent.com/20753323/118694174-15375c00-b80c-11eb-8b92-3f2f2ef4b1a5.mp4

## Environment

- OS: [e.g. Windows / Linux / macOS / iOS / Android]
- Browser: [e.g. Chrome, Safari] Firefox 88
- Autocomplete version: [e.g. 1.0.0] 1.0.1

Reproduce the issue on the linked Algolia documentation page using Firefox 88, focusing on the second combobox and Down-arrow navigation. Trace the combobox popup's keyboard-navigation entry point and verify that navigating options leaves the page scroll position unchanged without breaking option navigation.

Written by the indexing model from the issue text.