Remove unused signal from LogListWidget.

src/loglistwidget.cpp

@@ -93,5 +93,4 @@ void LogListWidget::copySelection()
 
 void LogListWidget::clearLog() {
   clear();
-  emit logCleared();
 }

src/loglistwidget.h

@@ -50,9 +50,6 @@ protected slots:
   void copySelection();
   void clearLog();
 
-signals:
-  void logCleared();
-
 protected:
   void keyPressEvent(QKeyEvent *event);