Change _get_column_width_characters second parameter type
Change _get_column_width_characters second parameter type

Also, add a note about how defaulting to len changes the behavior.

Signed-off-by: mulhern <7b51bcf507bcd7afb72bf8663752c0ddbeb517f6@redhat.com>

stratis-storage/stratis-cli,stratis-storage/stratis-cli