Don't exclude xkeyboard-config from minimal images (#2175244)
    
    See https://bugzilla.redhat.com/show_bug.cgi?id=2175244#c15 .
    We really need libxkbcommon for initial-setup to work properly,
    since an ordering change in systemd 253. This exclusion causes
    it to get dropped. libxkbcommon requires xkeyboard-config; since
    systemd only recommends libxkbcommon (rather than hard requiring
    it), the solver decides to honor the request to exclude
    xkeyboard-config by dropping both it and libxkbcommon.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>