Remove auto showFullScreen logic from main window.

src/mainwindow.cpp

@@ -87,7 +87,6 @@ MainWindow::MainWindow(QWidget *parent) :
     layout->addWidget(tab);
     ui->centralWidget->setLayout(layout);
     this->setWindowFlags (Qt::Window);
-    this->showFullScreen ();
     connect(EventCenter::Default(),&EventCenter::GUIErrorRaise,[=](){
         if (!msgDialog) msgDialog =  new GUIMessageDialog(this);
         msgDialog->showMessage("Something went error!");