Reader: clean unused code up

closeEvent is accepted by default, so this commit does not change the
application behavior. But Qt documentation recommends not relying on the
default value as subclasses may choose to clear it in their constructor.

YACReader/main_window_viewer.cpp

@@ -1433,8 +1433,6 @@ void MainWindowViewer::newVersion()
 
 void MainWindowViewer::closeEvent(QCloseEvent *event)
 {
-    Q_UNUSED(event)
-
     if (isClient)
         sendComic();
 
@@ -1446,7 +1444,7 @@ void MainWindowViewer::closeEvent(QCloseEvent *event)
     }
     conf.setMaximized(isMaximized());
 
-    emit(closed());
+    event->accept();
 }
 
 void MainWindowViewer::openPreviousComic()

YACReader/main_window_viewer.h

@@ -174,8 +174,6 @@ private:
     Qt::WindowFlags previousWindowFlags;
     QPoint previousPos;
     QSize previousSize;
-signals:
-    void closed();
 
 protected:
     void closeEvent(QCloseEvent *event) override;

YACReader/viewer.h

@@ -172,7 +172,6 @@ private:
 public:
     Viewer(QWidget *parent = nullptr);
     ~Viewer();
-    void toggleFullScreen();
     const QPixmap *pixmap();
     //Comic * getComic(){return comic;}
     const BookmarksDialog *getBookmarksDialog() { return bd; }