message: Use hardcoded objectClass in WallsLayer
  Foundry has that hardcoded, so this sets to only return specifically
  Wall rather than the configured objectClass
diff: @@ -320,7 +320,7 @@ declare global {
  interface LayerOptions extends PlaceablesLayer.LayerOptions<'Wall'> {
  name: 'walls';
  controllableObjects: true;
  - objectClass: ConfiguredObjectClassForName<'Wall'>;
  + objectClass: typeof Wall;
  quadtree: true;
  sheetClass: ConstructorOf<FormApplication>;
  sortActiveTop: boolean;
  