ProjectExplorerPlugin: Treat VirtualFolders as Foldes for context menus

Change-Id: I33556b0296a85c8321d785dbe819fcac98d0afb1
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/projectexplorer/projectexplorer.cpp

@@ -1654,6 +1654,7 @@ void ProjectExplorerPlugin::showContextMenu(QWidget *view, const QPoint &globalP
             else
                 contextMenu = d->m_subProjectMenu;
             break;
+        case VirtualFolderNodeType:
         case FolderNodeType:
             contextMenu = d->m_folderMenu;
             break;