Landing Pad not positionned during first episode

[Armandpl]

starship-landing-gym/starship_landing_gym/envs/starship_env.py

Line 212 in f84902a

if self.renderer is not None:

We update the landing pad position when calling _init_goal (which is called on reset).
But, to be able to use the env without rendering, we instantiate the renderer on the first call to render(). This means that during the first episode _init_goal is called before the renderer exists and therefore the landing pad isn't positioned on the screen.