`html/dom/elements-embedded.js` is invalid again

[AtkinsSJ]

The commit at 38d1646 broke the JSON again by removing a needed comma:

wpt/html/dom/elements-embedded.js

Lines 97 to 101 in 1ae17b3

	defaultMuted: {type: "boolean", domAttrName: "muted"}/*,
	// Note: once media loading attr is not tentative, uncomment and delete html reflection tests it replaces.
	loading: {type: "enum", keywords: ["lazy", "eager"], defaultVal: "eager", invalidVal: "eager"}*/
	width: "unsigned long",