[SoundCloud] Fix extraction of tracks like count

SoundCloud is using likes_count to return the like count of a track, like it
was the case before they switched to favoritings_count.

extractor/src/main/java/org/schabi/newpipe/extractor/services/soundcloud/extractors/SoundcloudStreamExtractor.java

@@ -133,7 +133,7 @@ public class SoundcloudStreamExtractor extends StreamExtractor {
 
     @Override
     public long getLikeCount() {
-        return track.getLong("favoritings_count", -1);
+        return track.getLong("likes_count", -1);
     }
 
     @Nonnull