Ensure MujocoViewer opens on .render() for render_mode human

fancy_gym/envs/mujoco/air_hockey/air_hockey_env_wrapper.py

@@ -130,6 +130,7 @@ class AirHockeyEnv(Environment):
             return self.base_env.render(record = True)
         elif self.render_mode == 'human':
             self.render_human_active = True
+            self.base_env.render()
         else:
             raise ValueError(f"Unsupported render mode: '{self.render_mode}'")
             
@@ -190,4 +191,4 @@ if __name__ == "__main__":
             J = 0.
             gamma = 1.
             steps = 0
-            env.reset()
+            env.reset()