GUI: Enable performance- and portability checks.

The CLI/LIB change earlier added own enable-flag for performance-
and portability-checks. This commit updates GUI to also enable
those new enable-flags.

gui/mainwindow.cpp

@@ -475,6 +475,8 @@ Settings MainWindow::GetCppcheckSettings()
     }
 
     result.addEnabled("style");
+    result.addEnabled("performance");
+    result.addEnabled("portability");
     result.addEnabled("information");
     result.addEnabled("missingInclude");
     result.debug = false;