Hands-on Rust B5.0: self.ecs -> ecs (page 289)

In main.rs at State::new, there isn’t self. so remove self.

&mut self.ecs -> &mut ecs

However, at reset_game_level needs self, so it is not same change at State::new.

Thank you. I’ve added the issue to the tracker, and it’ll be fixed in the next release. I could’ve sworn I’d got to that one already, but it looks like I missed one!