Fix formatting for gym env

gym-unity/gym_unity/envs/unity_env.py

                 self.visual_obs = visual_obs_list
             else:
                 self.visual_obs = self._preprocess_single(visual_obs[0][0, :, :, :])
-           
+
             default_observation = self.visual_obs
         else:
             default_observation = info.vector_observations[0, :]