zfs_main: fix alignment on props usage output

[robn]

Motivation and Context

Just playing with some ideas for alternate property display, and this stuck out as a very easy thing to tidy up.

Description

Make the property name column wider, so the columns align nicely.

How Has This Been Tested?

Just looking at it.

$ zfs get
...
	PROPERTY       EDIT  INHERIT   VALUES
...
	defer_destroy    NO       NO   yes | no
	encryptionroot   NO       NO   <filesystem | volume>
	filesystem_count  NO       NO   <count>
	guid             NO       NO   <uint64>
	keystatus        NO       NO   none | unavailable | available
	logicalreferenced  NO       NO   <size>
	logicalused      NO       NO   <size>
	mounted          NO       NO   yes | no
	objsetid         NO       NO   <uint64>
	origin           NO       NO   <snapshot>
	receive_resume_token  NO       NO   <string token>
	redact_snaps     NO       NO   <snapshot>[,...]
	refcompressratio  NO       NO   <1.00x or higher if compressed>
	referenced       NO       NO   <size>
	snapshot_count   NO       NO   <count>
	snapshots_changed  NO       NO   <date>
	type             NO       NO   filesystem | volume | snapshot | bookmark
	used             NO       NO   <size>
	usedbychildren   NO       NO   <size>
...

$ ./zfs get
...
	PROPERTY              EDIT  INHERIT   VALUES
...
	defer_destroy           NO       NO   yes | no
	encryptionroot          NO       NO   <filesystem | volume>
	filesystem_count        NO       NO   <count>
	guid                    NO       NO   <uint64>
	keystatus               NO       NO   none | unavailable | available
	logicalreferenced       NO       NO   <size>
	logicalused             NO       NO   <size>
	mounted                 NO       NO   yes | no
	objsetid                NO       NO   <uint64>
	origin                  NO       NO   <snapshot>
	receive_resume_token    NO       NO   <string token>
	redact_snaps            NO       NO   <snapshot>[,...]
	refcompressratio        NO       NO   <1.00x or higher if compressed>
	referenced              NO       NO   <size>
	snapshot_count          NO       NO   <count>
	snapshots_changed       NO       NO   <date>
	type                    NO       NO   filesystem | volume | snapshot | bookmark
	used                    NO       NO   <size>
	usedbychildren          NO       NO   <size>
...

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Performance enhancement (non-breaking change which improves efficiency)
• Code cleanup (non-breaking change which makes code smaller or more readable)
• Breaking change (fix or feature that would cause existing functionality to change)
• Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• Documentation (a change to man pages or other documentation)

Checklist:

• My code follows the OpenZFS code style requirements.
• I have updated the documentation accordingly.
• I have read the contributing document.
• I have added tests to cover my changes.
• I have run the ZFS Test Suite with this change applied.
• All commit messages are properly formatted and contain Signed-off-by.

[amotin]

I wonder whether we really need the first tab. There are too many lines that don't fit 80 columns. And we already use 4 spaces indentation at the last paragraph.

[robn]

I wonder whether we really need the first tab. There are too many lines that don't fit 80 columns. And we already use 4 spaces indentation at the last paragraph.

@amotin yeah, it's not amazing hey. I've scribbled it down on my list of things that could be nicer here, cheers.