Show patron group on an anonymized loan

Purpose: Show the patron group on a loan even when it’s been anonymized, and differentiate between anonymized loans with proxy borrowers from others.

As a staff member, I want to see patron group on anonymized loans, so that I can have more information about the item and how it circulated without identifying the patron.

Scenarios

1. Scenario
   • Given an anonymized loan
   • When viewing loan details
   • Then show the patron group for the borrower at the time the loan closed in the pane header
2. Scenario
   • Given a loan without a proxy borrower
   • When the loan is anonymized
   • Then:
     • Display "Anonymized" in the Borrower field
     • Display "-" in the Proxy borrower field
3. Scenario
   • Given a loan with a proxy borrower
   • When the loan is anonymized
   • Then:
     • Display "Anonymized" in the Borrower field
     • Display "Anonymized" in the Proxy borrower field