minor whitespace style changes

src/MainWindow.cpp

@@ -721,7 +721,7 @@ void MainWindow::setMenuBarInitialVisibility(bool visible)
 void MainWindow::showEvent(QShowEvent* aEvent)
 {
     // Make sure the 'initial' visibility is applied only once.
-    if (! _menuBarInitialVisibilityApplied) {
+    if (!_menuBarInitialVisibilityApplied) {
 
         // the initial visibility of menubar should be applied at this last
         // moment. Otherwise, the initial visibility will be determined by