WIP hardcode num tracks to 1

Author: jamieconnelly

src/streaming/MediaPlayer.js

@@ -1346,7 +1346,7 @@ function MediaPlayer() {
                 textTrackInfo.kind = trackKindMap.caption; // getKind();
                 // textTrackInfo.roles = mediaInfo.roles;
                 // textTrackInfo.accessibility = mediaInfo.accessibility;
-                const totalNrTracks = 2; // (mediaInfos ? mediaInfos.length : 0) + embeddedTracks.length;
+                const totalNrTracks = 1; // (mediaInfos ? mediaInfos.length : 0) + embeddedTracks.length;
                 textTracks.addTextTrack(textTrackInfo, totalNrTracks);
             } else {
                 // ????