Sonogram: Fix parameter mismatch in header

src/analyzer/sonogram.h

@@ -32,7 +32,7 @@
 class Sonogram : public Analyzer::Base {
   Q_OBJECT
  public:
-  Q_INVOKABLE explicit Sonogram(QWidget *);
+  Q_INVOKABLE explicit Sonogram(QWidget *parent);
   ~Sonogram();
 
   static const char *kName;