fix(media-composition): remove audio chapters

Fixes #245 by removing audio chapters from `mediaComposition`. The reason for
this is that audio chaptering is physical, not logical. This results in data
inconsistency and prevents chapter change events from being sent.

- delete audio chapters from audio URNs or audio chapters from video URNs

Ref: SRGSSR/pillarbox-apple#842

src/dataProvider/model/MediaComposition.js

@@ -72,7 +72,11 @@ class MediaComposition {
    * @returns {Array.<Chapter>} of chapters
    */
   getChapters() {
-    return this.chapterList;
+    const AUDIO = 'AUDIO';
+
+    if (this.getMainChapter().mediaType === AUDIO) return [];
+
+    return this.chapterList.filter(({ mediaType }) => mediaType !== AUDIO);
   }
 
   /**