Fix re-emptying image

[dmitrylyzo]

emptyImageElement is called twice.
The first call moves background to data-src.
The second call empties data-src.

jellyfin-web/src/components/images/imageLoader.js

Line 111 in 832a204

function emptyImageElement(elem) {

This can happen because of repeated animation frame request for the same element.

jellyfin-web/src/components/images/imageLoader.js

Lines 70 to 72 in 832a204

	requestAnimationFrame(() => {
	emptyImageElement(target);
	});

Changes
Fix re-emptying image

Issues
Fixes #3140

Alternatively, we could collect the affected elements into an array and request the animation frame once.
https://github.com/dmitrylyzo/jellyfin-web/tree/fix-genre-image-2

[sonarcloud]

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