Someone who is Reassigned as a Superuser should not have 'Revoked' engagements

[TayaLee8]

If someone is reassigned to a Superuser, their engagements should not have status 'Revoked' since they now have complete access to all engagements. (The status should just have a dash instead)

1. Login as a Superuser
2. Reassign someone to a Superuser
3. Click on their User Details page
4. See all the 'revoked' engagements

Current Behaviour

• When someone is reassigned as a Superuser, their previously assigned engagements now show 'Revoked'

Desired Behaviour

• When someone is reassigned as a Superuser, they now have complete access and their previously assigned engagements are not 'Revoked'. Instead of having 'Revoked' on their previous engagements, it should just have a dash (-)