Sonogram: Remove unused destructor

src/analyzer/sonogram.cpp

@@ -31,8 +31,6 @@ const char *Sonogram::kName = QT_TRANSLATE_NOOP("AnalyzerContainer", "Sonogram")
 Sonogram::Sonogram(QWidget *parent)
     : Analyzer::Base(parent, 9) {}
 
-Sonogram::~Sonogram() {}
-
 void Sonogram::resizeEvent(QResizeEvent *e) {
 
   Q_UNUSED(e)

src/analyzer/sonogram.h

@@ -33,7 +33,6 @@ class Sonogram : public Analyzer::Base {
   Q_OBJECT
  public:
   Q_INVOKABLE explicit Sonogram(QWidget *parent);
-  ~Sonogram();
 
   static const char *kName;