0c00c7f backend: fix wrong message validation class

Authored and Committed by praiskup 4 years ago
    backend: fix wrong message validation class
    
    Reported by @redi on #fedora-admin channel:
    <redi> I got an email for each of the chroots, fairly soon after
    submitting the build (maybe right away, not sure)
    <redi> the email said "finished with 'running'"
    
        
file modified
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