Scope GUI: removed unused traceMemoryChanged signal

sdrbase/gui/glscopegui.cpp

@@ -800,7 +800,6 @@ void GLScopeGUI::on_memIndex_valueChanged(int value)
 		// Set value
 		m_glScope->setMemHistoryShift(value);
 		ui->sampleRateText->setText(tr("%1\nkS/s").arg(m_glScope->getSampleRate() / 1000.0f, 0, 'f', 2));
-		emit traceMemoryChanged(value);
 	}
 }
 

sdrbase/gui/glscopegui.h

@@ -30,9 +30,6 @@ public:
 
 	bool handleMessage(Message* message);
 
-signals:
-	void traceMemoryChanged(int);
-
 private:
 	Ui::GLScopeGUI* ui;