Use shared pointers for moodbar pipelines

Possible fix for #1633

src/moodbar/moodbarpipeline.cpp

@@ -2,7 +2,7 @@
  * Strawberry Music Player
  * This file was part of Clementine.
  * Copyright 2012, David Sansome <me@davidsansome.com>
- * Copyright 2019-2024, Jonas Kvinge <jonas@jkvinge.net>
+ * Copyright 2019-2025, Jonas Kvinge <jonas@jkvinge.net>
  *
  * Strawberry is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -56,7 +56,11 @@ MoodbarPipeline::MoodbarPipeline(const QUrl &url, QObject *parent)
       success_(false),
       running_(false) {}
 
-MoodbarPipeline::~MoodbarPipeline() { Cleanup(); }
+MoodbarPipeline::~MoodbarPipeline() {
+
+  Cleanup();
+
+}
 
 GstElement *MoodbarPipeline::CreateElement(const QString &factory_name) {