Fix subcommands with hyphens (and periods, spaces, etc) in zsh

[brentyi]

A call to wordify() was missing.

Example that breaks with the current version on master:

import argparse

import shtab

parser = argparse.ArgumentParser(prog="test.py")
subparsers = parser.add_subparsers()

sub1 = subparsers.add_parser("subcommand-1", help="First subcommand")
sub2 = subparsers.add_parser("subcommand-2", help="Second subcommand")

print(shtab.complete_zsh(parser))

[sourcery-ai[bot]]

Sourcery Code Quality Report

Merging this PR leaves code quality unchanged.

Quality metrics	Before	After	Change
Complexity	47.11 ⛔	47.11 ⛔	0.00
Method Length	136.35 😞	136.70 😞	0.35 👎
Working memory	1.67 ⭐	1.67 ⭐	0.00
Quality	25.93% 😞	25.93% 😞	0.00%

Other metrics	Before	After	Change
Lines	761	763	2

Changed files	Quality Before	Quality After	Quality Change
shtab/init.py	25.93% 😞	25.93% 😞	0.00%

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
shtab/init.py	get_bash_commands	78 ⛔	589 ⛔		1.22% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_zsh	62 ⛔	909 ⛔		2.38% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_tcsh	53 ⛔	470 ⛔		4.99% ⛔	Refactor to reduce nesting. Try splitting into smaller methods
shtab/init.py	complete_bash	2 ⭐	106 🙂	11 😞	64.30% 🙂	Extract out complex expressions
shtab/init.py	add_argument_to	4 ⭐	89 🙂	11 😞	64.67% 🙂	Extract out complex expressions

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• ⛔ very poor

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