Fix other problems since commit f6e5696...

... Problem with static initialization order of ReservedCommandFlags, caused
wrong enablement of menu items (at least on Mac), such as Plot Spectrum or
Contrast enabled when there was no selection

src/effects/EffectUI.cpp

@@ -1155,7 +1155,7 @@ void EffectUIHost::OnApply(wxCommandEvent & evt)
       MenuManager::Get( project ).ReportIfActionNotAllowed(
          mEffect->GetName(),
          flags,
-         WaveTracksSelectedFlag | TimeSelectedFlag);
+         WaveTracksSelectedFlag() | TimeSelectedFlag());
       if (!allowed)
          return;
    }