refactor: use C++11 default initializers

src/qt/peertablemodel.cpp

@@ -28,10 +28,7 @@ PeerTableModel::PeerTableModel(interfaces::Node& node, QObject* parent) :
     refresh();
 }
 
-PeerTableModel::~PeerTableModel()
-{
-    // Intentionally left empty
-}
+PeerTableModel::~PeerTableModel() = default;
 
 void PeerTableModel::startAutoRefresh()
 {