Can't clear force fault on spare

[tonyhutter]

System information

Type	Version/Name
Distribution Name	RHEL
Distribution Version	8.10
Kernel Version	4.18
Architecture	x86-64
OpenZFS Version	2.2.4

Describe the problem you're observing

Our operators had force-faulted a vanilla spare (non-dRAID) with zpool offline -f <tank> <spare-vdev>. They then tried the normal zpool clear <tank> <spare-vdev> to clear the fault, but got this error:

cannot clear errors for <spare-vdev>: device is reserved as a hot spare

We should be able to clear the fault on spares like we do on normal vdevs.