Drop fedora-live-minimization use from cinnamon
    
    live-minimization is kinda old, and dates from the time we were
    trying to fit in CD size. No-one cares much about that any more.
    One of these exclusions (sane-backends) was contradictory for
    Cinnamon lives and broke the compose since the recent dnf change
    to fail compose on dependency issues (because the cinnamon comps
    group explicitly includes sane-backends-drivers-scanners, but
    this exclusion excludes one of its deps). To resolve that,
    @grinnz is fine with just dropping the use of live-minimization
    from the cinnamon images entirely, so this does that.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>