Able to enter duplicate Fee/Fine Owner

Overview: 

We are now able to enter a duplicate fee/fine owner.   **   Previously this was not allowed.

Steps to Reproduce:

1. Log into https://bugfest-iris.folio.ebsco.com/ as admin user
2. Go to Settings>Users>Fee/fine: Owners
3. Enter Fee/Fine Owner of "Duplicate fee/fine owner"
4. Enter another Fee/Fine Owner of "Duplicate fee/fine owner"

Expected Results:

Not allowed to save the second Fee/Fine Owner with a name that already exists in the table.  On Honeysuckle BugFest instance this error message appears:  Fee/fine Owner already exists

Actual Results:

Able to add a second Fee/Fine Owner with a name that already exists in the table.