PlaylistItem: Add dtor

src/playlist/playlistitem.cpp

@@ -41,6 +41,8 @@ using namespace Qt::Literals::StringLiterals;
 
 PlaylistItem::PlaylistItem(const Song::Source source) : should_skip_(false), source_(source) {}
 
+PlaylistItem::~PlaylistItem() = default;
+
 PlaylistItemPtr PlaylistItem::NewFromSource(const Song::Source source) {
 
   switch (source) {

src/playlist/playlistitem.h

@@ -49,6 +49,7 @@ using std::enable_shared_from_this;
 class PlaylistItem : public enable_shared_from_this<PlaylistItem> {
  public:
   explicit PlaylistItem(const Song::Source source);
+  virtual ~PlaylistItem();
 
   static SharedPtr<PlaylistItem> NewFromSource(const Song::Source source);
   static SharedPtr<PlaylistItem> NewFromSong(const Song &song);