message: Remove trivial tests from NotesLayer
diff: import { expectType } from 'tsd';
  -expectType<'Note'>(NotesLayer.documentName);
  expectType<NotesLayer | undefined>(NotesLayer.instance);
  -expectType<NotesLayer.LayerOptions>(NotesLayer.layerOptions);
  -expectType<'notes'>(NotesLayer.layerOptions.name);
  expectType<typeof Note>(NotesLayer.layerOptions.objectClass);
  -expectType<'notesDisplayToggle'>(NotesLayer.TOGGLE_SETTING);
  -
  -expectType<void>(NotesLayer.registerSettings());
  -
  const layer = new NotesLayer();
  expectType<typeof Note>(layer.options.objectClass);
  expectType<NotesLayer.LayerOptions>(layer.options);
  expectType<'notes'>(layer.options.name);
  -
  -expectType<NotesLayer>(layer.activate());
  -
  -expectType<NotesLayer>(layer.deactivate());
  