Drop another blacklist use
    
    This is in something we're never going to deploy again anyway so
    it feels kind of absurd, but hey. The variable isn't actually
    defined anywhere any more (tflink wiped the vars files that set
    it) so this was actually technically broken. This technically
    makes it less broken so I am okay with it!
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>