Jumper Hard example may have an error with goal vector.

Hey @metinc , I was wondering what you think about this line in the examples refactor. https://github.com/edbeeching/godot_rl_agents_examples/blob/72e4825651f1c9b078c3e7861b56267f78d0b0d6/examples/JumperHard/AIController3D.gd#L25 I think this should be: ``` goal_vector = goal_vector.rotated(Vector3.UP, -_player.rotation.y) ``` What do you think?