UI: fix default queue; don't error on empty args

[yashlamba]

• The queue selected by default when doing a manual run should be the default queue for that job.
• Running with empty args used to create a run with default args and also raise a validation error. Now the error is not shown the case of empty args.

[slint]

Suggested change

	config={config}
	onError={this.onError}
	queue={queue}
	args={args}
	queue={queue}
	onError={this.onError}

1. nit: order of parameters :)
2. nit/other: not sure why it's config and not args so that it matches what is expected in the REST API payload