On updating an existing organisation role the role value is updated but not the role label

Overview:

Following implementation of ERM-1540 updating Organisation roles does not correctly update the role

Steps to Reproduce:

1. Make sure there are at least two values in the SubscriptionAgreementOrg.Role ref data category (e.g. Role1, Role2)
2. Create an agreement, add an Organization with role = Role1, save the agreement
3. Agreement saved correctly
4. Edit agreement, and change existing role to Role2, save the Agreement
5. View agreement - notice that the Org is still listed as "Role1". Check the JSON returned from the endpoint - note that the role has label == "Role1" but value == "role2"

Expected Results:

The Role should only be able to have a label and value consistent with the ref data. When the role is saved, the correct value should be saved and the label should reflect the saved value

Actual Results:

The role is saved with a new value but incorrect label

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