Fix for bug 2030 - Manage dialog

Windows: Manage dialog in effects has reduced vertical height
OK and Cancel buttons.
Bug also affected Linux.

src/effects/Effect.cpp

@@ -3655,6 +3655,7 @@ void EffectUIHost::OnSaveAs(wxCommandEvent & WXUNUSED(evt))
 
    dlg.SetSize(dlg.GetSizer()->GetMinSize());
    dlg.Center();
+   dlg.Fit();
 
    while (true)
    {