Page scrolls to bottom upon clicking a menu with modal: true

[marbemac]

🐛 Bug report

Current behavior

Page scrolls to bottom upon clicking a menu with modal: true.

Steps to reproduce the bug

1. Open https://reakit.io/docs/menu/#usage
2. Replace const menu = useMenuState(); with const menu = useMenuState({ modal: true }); in the example code.
3. Click on the Preferences button, and note how the page scrolls to the bottom. If you click it again without reloading the page it will work as expected - this only occurs on first open.

Expected behavior

Do not scroll to bottom of page when opening a menu.

Possible solutions

This issue was introduced with #801. I have checked out the commit prior to this change and the bug is not present.

Gif of behavior:

[open-collective-bot]

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