Move where icons in menus attribute is set

Without this, icons are not visible on macOS

src/Gui/Application.cpp

@@ -2283,6 +2283,10 @@ void Application::runApplication()
     MainWindow mw;
     mw.setProperty("QuitOnClosed", true);
 
+    // https://forum.freecad.org/viewtopic.php?f=3&t=15540
+    // Needs to be set after app is created to override platform defaults (qt commit a2aa1f81a81)
+    QApplication::setAttribute(Qt::AA_DontShowIconsInMenus, false);
+
 #ifdef FC_DEBUG  // redirect Coin messages to FreeCAD
     SoDebugError::setHandlerCallback(messageHandlerCoin, 0);
 #endif

src/Gui/StartupProcess.cpp

@@ -107,8 +107,6 @@ void StartupProcess::setupApplication()
     // compression for tablet events here to solve that.
     QCoreApplication::setAttribute(Qt::AA_CompressTabletEvents);
 #endif
-    // https://forum.freecad.org/viewtopic.php?f=3&t=15540
-    QApplication::setAttribute(Qt::AA_DontShowIconsInMenus, false);
 }
 
 void StartupProcess::execute()