fix: "media likely unsupported" is not detected on some sites (like invidious)

[WofWca]

Like here https://yewtu.be/ (or see https://docs.invidious.io/instances/).

(a part of) the responsible code:

jumpcutter/src/entry-points/content/AllMediaElementsController.ts

Lines 433 to 435 in ce1976d

	const elCrossOrigin = this.activeMediaElementSourceIsCrossOrigin = isSourceCrossOrigin(el);
	const onMaybeSourceChange = () => {
	this.activeMediaElementSourceIsCrossOrigin = isSourceCrossOrigin(el);

Related: #47

[WofWca]

This is weird. el.currentSrc's origin is equal to location.origin. But the video is actually loaded from Google's servers. I'm not sure how to detect that. Perhaps WebAudio/web-audio-api#2453 can help when it's implemented.