Show audio track labels (#947)

* fix: add label to audio track options.

* style: whitespace revert to spaces.

* style: undo formatting from ???.

* style: empty line at eof.

src/content-handlers/iiif/modules/uv-mediaelementcenterpanel-module/MediaElementCenterPanel.ts

@@ -99,6 +99,7 @@ export class MediaElementCenterPanel extends CenterPanel<
  canvas.getRenderings().forEach((rendering: Rendering) => {
  if (this.isTypeMedia(rendering)) {
  sources.push({
+ label: rendering.getLabel().getValue() ?? rendering.getFormat().toString(),
  type: rendering.getFormat().toString(),
  src: rendering.id,
  });