Revert "zfs list: Allow more fields in ZFS_ITER_SIMPLE mode"

This reverts commit f6a0dac84a.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Mark Maybee <mark.maybee@delphix.com>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Closes #12938

contrib/pam_zfs_key/pam_zfs_key.c

@@ -534,7 +534,7 @@ zfs_key_config_get_dataset(zfs_key_config_t *config)
 			return (NULL);
 		}
 
-		(void) zfs_iter_filesystems(zhp, 0, find_dsname_by_prop_value,
+		(void) zfs_iter_filesystems(zhp, find_dsname_by_prop_value,
 		    config);
 		zfs_close(zhp);
 		char *dsname = config->dsname;