fixing whiteboard alembic revision so that it doesn't error out
    
    Summary: When D22 was merged in, the alembic revision wasn't updated for another change that landed after it was approved
    
    Test Plan: run alembic, does it blow up saying there are multiple heads?
    
    Reviewers: adamwill
    
    Differential Revision: https://phab.qadevel.cloud.fedoraproject.org/D828