message: Fix general and instance class set on window
  This fixes a regression introduced in which caused the general
  and instance class to be swapped.
diff: @@ -335,7 +335,7 @@ impl Window {
  let builder = WindowBuilder::new()
  .with_title(&identity.title)
  - .with_name(&identity.class.instance, &identity.class.general)
  + .with_name(&identity.class.general, &identity.class.instance)
  .with_visible(false)
  .with_transparent(true)
  .with_decorations(window_config.decorations != Decorations::None)
  