fix: dash group changes should not stop playlist loader

Author: ziddey

src/media-groups.js

@@ -70,6 +70,11 @@ export const startLoaders = (playlistLoader, mediaType) => {
  * @function onGroupChanged
  */
 export const onGroupChanged = (type, settings) => () => {
+  if (settings.sourceType === 'dash') {
+    // only one playlist loader for dash. do not stop.
+    return;
+  }
+
   const {
     segmentLoaders: {
       [type]: segmentLoader,