Remove the ociarchive entries from compose metadata
    
    pdc_import_compose toddler started failing on unknown format on compose
    metadata. This caused the toddler to fail with errors. This removes the ofending
    image format because adding new format in PDC is not simple.
    
    More details in https://pagure.io/fedora-infrastructure/issue/11731.
    
    Signed-off-by: Michal Konecny <mkonecny@redhat.com>