AMI tables: don't collapse by default
    
    As of right now, we only have two tables, one for x86_64 and one
    for aarch64. It seems rude and a bit confusing to collapse
    aarch64 by default when there's only two tables - the reason for
    collapsing all but one table by default was not to overwhelm the
    page with AMIs, but with only two tables that's not a concern,
    and sometimes people miss that tables are expandable.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>