fix manual updating by passing the main window to the updater instead of the menubar

Source/Core/DolphinQt/MenuBar.cpp

@@ -499,7 +499,7 @@ void MenuBar::InstallUpdateManually()
 
   track = "dev";
 
-  auto* updater = new Updater(this);
+  auto* updater = new Updater(this->parentWidget());
 
   if (!updater->CheckForUpdate())
   {