Revert "only prevent stopLoaders for dash (fix for recent updates)"

This reverts commit b848006.

Author: ziddey

src/media-groups.js

@@ -93,11 +93,13 @@ export const onGroupChanged = (type, settings) => () => {
   mediaType.lastGroup_ = activeGroup;
   mediaType.lastTrack_ = activeTrack;
 
-  if (sourceType !== 'dash') {
-    // only one playlist for dash. do not stop.
-    stopLoaders(segmentLoader, mediaType);
+  if (sourceType === 'dash') {
+    // only one playlist loader for dash. do not stop.
+    return;
   }
 
+  stopLoaders(segmentLoader, mediaType);
+
   if (!activeGroup || activeGroup.isMasterPlaylist) {
     // there is no group active or active group is a main playlist and won't change
     return;