fix: ami chart selection bug

[emilyjablonski]

This PR addresses #984

• Addresses the issue in full
• Addresses only certain aspects of the issue

Description

There is an intermittent issue where when you go to a listing edit page and open a unit drawer, if the unit has an ami chart selected that is not first in the list - sometimes the unit drawer will load with the first ami chart selected anyway.

How Can This Be Tested/Reviewed?

The new seed has multiple ami charts. Create a listing with a unit that has an ami chart selected that is not the first chart that appears in the dropdown. Re-open the edit page and open the unit drawer and ensure the proper ami chart is selected.

Will backport the fix to core.

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

[ludtkemorgan]

Just one cleanup comment, otherwise looks good!