fix isMultiple check by adding compare with false

[antpaw]

Reasons for making this change

This fixes the issue where chakra-ui would render a multiselect for a oneOf field select

Checklist

• I'm updating documentation
  • I've checked the rendering of the Markdown text I've added
• I'm adding or updating code
  • I've added and/or updated tests. I've run npm run test:update to update snapshots, if needed.
  • I've updated docs if needed
  • I've updated the changelog with a description of the PR
• I'm adding a new feature
  • I've updated the playground with an example use of the feature

[heath-freenome]

Please rebase and update the CHANGELOG.md

[heath-freenome]

@antpaw Just a little bit more work and we can get this over the line

[nickgros]

Looks good, thanks @antpaw ! I will merge this as soon as it passes and we'll release 5.12.2 soon!

Requested changes were made