Log async responses to the database when run using llm --async

I punted on that earlier for:
- #507

https://github.com/simonw/llm/blob/a6d62b7ec97d8fe3658c53cee32e777f1e23d776/llm/cli.py#L425-L431

	# Log to the database
	if (logs_on() or log) and not no_log and not async_:
	log_path = logs_db_path()
	(log_path.parent).mkdir(parents=True, exist_ok=True)
	db = sqlite_utils.Database(log_path)
	migrate(db)
	response.log_to_db(db)

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