zpool(8): correct list of default properties in 'list'.

The default provides output in the following form:

NAME       SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP
HEALTH  ALTROOT

this corrects the man page.

Also submitted upstream as
https://github.com/openzfs/openzfs/pull/632/files (with slightly
different changes needed)