Revert "PR#2576: db: add debian package archivetype"
    
    This reverts commit b19f1760bf5b6ee534b6c8efd3b21f4edd904076, reversing
    changes made to b3f548f80335c7226fffcf58740e7d03faeded18.
    
    We've agreed that adding new archivetypes should be done via API not by
    default values in db.
    
    Related: https://pagure.io/koji/issue/2575
    Related: https://pagure.io/koji/pull-request/2576