Revert "fix: dash group changes should not stop playlist loader"

This reverts commit 6967321.

Author: ziddey

src/media-groups.js

@@ -73,7 +73,6 @@ export const startLoaders = (playlistLoader, mediaType) => {
  */
 export const onGroupChanged = (type, settings) => () => {
   const {
-    sourceType,
     segmentLoaders: {
       [type]: segmentLoader,
       main: mainSegmentLoader
@@ -93,11 +92,6 @@ export const onGroupChanged = (type, settings) => () => {
   mediaType.lastGroup_ = activeGroup;
   mediaType.lastTrack_ = activeTrack;
 
-  if (sourceType === 'dash') {
-    // only one playlist loader for dash. do not stop.
-    return;
-  }
-
   stopLoaders(segmentLoader, mediaType);
 
   if (!activeGroup || activeGroup.isMasterPlaylist) {