Admin Helper does not correctly validate notifications for Multi Select

Summary

Checking notifications for issues where the event type uses a Multi Select CF with a group in it does not validate correctly and advises that the user should not be notified when they should be.

Environment

Version is 1.10.1 but this is not available from this project.

Steps to Reproduce

1. Add a Multi Select Custom Field.
2. Configure it to have an option with a group in it, e.g.: jira-administrators as per the attached screenshot.
3. Add this Custom Field to the notification scheme.
4. Check the helper to see if a user within the jira-administrators group is notified (in this case it is the admin user).

Expected Results

They are listed as being notified.

Actual Results

They are not listed as being notified.

Notes

The value of the Multi Select field is case insensitive, so JIRA-ADMINISTRATORS will match the jira-administrators group (verified in 6.0.8).