spec: Fix enablement of grub services and timer
    
    Fix enablement of grub services and timer:
    - Switch back to static enablement for grub services in tools package
    - Add %%triggerpostun to apply grub-boot-success.timer preset
      when upgrading from older versions where this was not a preset
    
    Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2247635
    Signed-off-by: Christian Glombek <cglombek@redhat.com>
    Signed-off-by: Hans de Goede <hdegoede@redhat.com>