Optional ZFS pool features can have three states: disabled, enabled, and
active. Enabled means that ZFS will use them if it needs them, but they
haven't changed the on-disk format yet, so they can still be switched
off. But active features have already changed the on-disk format, so
they can't be switched off. Disabled features may not be used.
When enabling such a feature via the zpool.present state, treat "active"
as identical to "enabled".
Fixes#62390
