Better equals check

It ensures that queues are not the same. Without this check when you have multiple videos in the backstack and navigating back via Back button you'll get duplicated videos

app/src/main/java/org/schabi/newpipe/player/playqueue/PlayQueue.java

@@ -528,7 +528,16 @@ public abstract class PlayQueue implements Serializable {
             return false;
         }
         final PlayQueue other = (PlayQueue) obj;
-        return streams.equals(other.streams);
+        if (size() != other.size()) {
+            return false;
+        }
+        for (int i = 0; i < size(); i++) {
+            // Check is based on URL
+            if (!streams.get(i).getUrl().equals(other.streams.get(i).getUrl())) {
+                return false;
+            }
+        }
+        return true;
     }
 
     @Override