[Forwardport] Add sort order to user agent rules table headers

[JRhyne]

Original Pull Request

#16704

Summary / Description

Only one column on the User Agent Rules table had a sort order. This was causing the content of the table rows to not match the content of the table. I added the sortOrder attribute on the other two columns and this fixed the issue.

Fixed Issues (if relevant)

1. User Agent Rules table headers do match content of rows. #16703 : User Agent Rules table headers do match content of rows

Manual testing scenarios

1. Visit the page where you can edit a design configuration (change the theme). And review the table's headers.

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• [] All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @JRhyne. Thank you for your contribution
Here is some useful tips how you can test your changes using Magento test environment.
Add the comment under your pull request to deploy test or vanilla Magento instance:

• @magento-engcom-team give me test instance - deploy test instance based on PR changes
• @magento-engcom-team give me {$VERSION} instance - deploy vanilla Magento instance

For more details, please, review the Magento Contributor Assistant documentation

[magento-engcom-team]

Hi @JRhyne. Thank you for your contribution.
We will aim to release these changes as part of 2.3.0.
Please check the release notes for final confirmation.