[fix] Missing closing brace for class

[mdlama]

Before you submit this pull request, please make sure:

• Make sure there are links in the PR to the source JIRA card(s) and hubzero ticket(s)
• Include a brief summary of the issue in your own words

A migration file was missing a closing brace for the class, causing migration updates to fail.

• Include a brief summary of the fix/changed code

I just added the closing brace and styled some of the code to match standards.

• Include a brief summary of your testing. What did you specifically do to investigate that this change has the correct results?

This fix was tested with a migration up and passed.

• Indicate if the change needs to be hotfixed to any production hubs before a normal core rollout

Maybe? It's possible migration scripts failed on a recent code push.

• Double check someone is assigned to review the ticket

Thanks!