Remove debugging leftover

renamingutility/renamingengine.cpp

@@ -359,11 +359,6 @@ PreviewGenerator::PreviewGenerator(RenamingEngine *engine)
     connect(this, &PreviewGenerator::finished, this, &PreviewGenerator::deleteLater);
 }
 
-PreviewGenerator::~PreviewGenerator()
-{
-    printf("preview gone\n");
-}
-
 void PreviewGenerator::run()
 {
     m_engine->resetStatus();

renamingutility/renamingengine.h

@@ -26,7 +26,6 @@ class PreviewGenerator final : public QThread {
     Q_OBJECT
 public:
     explicit PreviewGenerator(RenamingEngine *engine);
-    ~PreviewGenerator() override;
 
 protected:
     void run() final;