Statically enable rpm-ostree-countme timer
    
    Commit a0970d0 generalized the rpm-ostree count me unit activation using
    the systemd preset configuration file.
    
    This previous change incorrectly assumed that all rpm-ostree based
    variants where using the presets as source of truth work enabled
    services, but this is right now only true for Fedora CoreOS.
    
    Work is in progress to update Silverblue/Kinoite and IoT to preset-all
    by default. However this change will most likely be F36+ only.
    
    Thus this change statically enables the timer unit for IoT, Silverblue &
    Kinoite. Users can still opt out of counting as before by masking the
    unit and this will not re-enable it for those that opted-out earlier.
    
    See:
    - https://pagure.io/workstation-ostree-config/pull-request/246
    - https://github.com/coreos/fedora-coreos-config/blob/testing-devel/manifests/ignition-and-ostree.yaml#L39..L48
    - https://github.com/coreos/fedora-coreos-config/pull/73
    - https://github.com/coreos/fedora-coreos-config/pull/77
    - https://github.com/coreos/fedora-coreos-config/pull/122
    - https://github.com/coreos/rpm-ostree/issues/1803
    
    Fixes: a0970d0 90-default.preset: Enable rpm-ostree count me by default