MujocoEnv refactor remove single line function _reset_simulation() (

#960)

gymnasium/envs/mujoco/mujoco_env.py

@@ -120,12 +120,6 @@ def _initialize_simulation(self) -> Tuple[Any, Any]:
         """
         raise NotImplementedError
 
-    def _reset_simulation(self) -> None:
-        """
-        Reset MuJoCo simulation data structures, mjModel and mjData.
-        """
-        raise NotImplementedError
-
     def _step_mujoco_simulation(self, ctrl, n_frames) -> None:
         """
         Step over the MuJoCo simulation.
@@ -151,7 +145,7 @@ def reset(
     ):
         super().reset(seed=seed)
 
-        self._reset_simulation()
+        mujoco.mj_resetData(self.model, self.data)
 
         ob = self.reset_model()
         info = self._get_reset_info()
@@ -244,9 +238,6 @@ def _initialize_simulation(
         data = mujoco.MjData(model)
         return model, data
 
-    def _reset_simulation(self):
-        mujoco.mj_resetData(self.model, self.data)
-
     def set_state(self, qpos, qvel):
         super().set_state(qpos, qvel)
         self.data.qpos[:] = np.copy(qpos)