Use url comparison between queue items when disabling preloading

From #4562: Disable player stream preloading only if the current stream is going to be replaced for sure (see this). equals() was implemented for PlayQueueItems, so that (only) the url is compared when checking them.

app/src/main/java/org/schabi/newpipe/fragments/detail/VideoDetailFragment.java

@@ -813,7 +813,7 @@ public void selectAndLoadVideo(final int newServiceId,
                                    @NonNull final String newTitle,
                                    @Nullable final PlayQueue newQueue) {
         if (isPlayerAvailable() && newQueue != null && playQueue != null
-                && !Objects.equals(newQueue.getItem(), playQueue.getItem())) {
+                && playQueue.getItem() != null && !playQueue.getItem().getUrl().equals(newUrl)) {
             // Preloading can be disabled since playback is surely being replaced.
             player.disablePreloadingOfCurrentTrack();
         }