Prefer taking `stroke` argument with stroke type rather than its fields

[jamesrswift]

codly/codly.typ

Lines 84 to 89 in 88d90dc

	// The stroke width to use to surround the code block.
	// Set to `none` to disable.
	stroke-width: none,
	// The stroke color to use to surround the code block.
	stroke-color: none,

[Dherse]

This is the case as of 6e4a60f.