Re-use string constant in SubdirsProjectWizard.

Change-Id: I326ecc8c45c39c7fe544a662b2aff44adaf4c332
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/qt4projectmanager/wizards/subdirsprojectwizard.cpp

@@ -45,7 +45,7 @@ namespace Internal {
 SubdirsProjectWizard::SubdirsProjectWizard()
   : QtWizard(QLatin1String("U.Qt4Subdirs"),
              QLatin1String(ProjectExplorer::Constants::PROJECT_WIZARD_CATEGORY),
-             QLatin1String("Non-Qt Project"),
+             QLatin1String(ProjectExplorer::Constants::PROJECT_WIZARD_CATEGORY_DISPLAY),
              tr("Subdirs Project"),
              tr("Creates a qmake-based subdirs project. This allows you to group "
                 "your projects in a tree structure."),