Remove HLS thumbnail workaround

This has been fixed in Shaka:
- shaka-project/shaka-player#3840
- shaka-project/shaka-player#3858

Resources/Private/JavaScript/VideoPlayer/ThumbnailPreview.js

@@ -383,16 +383,6 @@ export default class ThumbnailPreview {
    * @param {SeekPosition} seekPosition
    */
   renderImageAndShow(uri, thumb, tilesetImage, seekPosition) {
-    // When width/height are in the interval [0,1], we treat them as relative
-    // to the tileset size. See `CustomHlsParser`.
-    if ((0 <= thumb.width && thumb.width <= 1) && (0 <= thumb.height && thumb.height <= 1)) {
-      thumb.positionX *= tilesetImage.width;
-      thumb.width *= tilesetImage.width;
-
-      thumb.positionY *= tilesetImage.height;
-      thumb.height *= tilesetImage.height;
-    }
-
     this.ensureDisplaySize(thumb.width, thumb.height);
 
     this.renderImage(uri, thumb, tilesetImage);

Resources/Private/JavaScript/VideoPlayer/VariantGroups.js

@@ -67,18 +67,6 @@ export default class VariantGroups {
     for (const variant of this.manifest.variants) {
       this.addVariant(variant);
     }
-
-    for (const imageStream of this.manifest.imageStreams) {
-      // The HLS parser apparently does not report dimensions of thumbnails,
-      // so `getThumbnails()` will not return correct size and position of a
-      // thumbnail within the tileset. By setting width = 1 and height = 1,
-      // we will at least receive the relative size and position, which in
-      // `ThumbnailPreview::renderImageAndShow()` we scale to the absolute
-      // values.
-      // TODO: Dispense of this
-      imageStream.width = 1;
-      imageStream.height = 1;
-    }
   }
 
   /**