message: fix UBO handle leak with ShadowMap
  This wasn't a big issue because the "leak" would be cleaned when the
  engine is destroyed.
diff: @@ -62,6 +62,7 @@ void ShadowMap::terminate(FEngine& engine) {
  engine.destroyCameraComponent(e);
  }
  engine.getEntityManager().destroy(sizeof(entities) / sizeof(Entity), entities);
  + mPerViewUniforms.terminate(engine.getDriverApi());
  }
  ShadowMap::~ShadowMap() = default;
  