[Fix] Ensure pos_shaping_factor is propagated in buzz_wire (#160)

Author: itwasabhi

vmas/scenarios/buzz_wire.py

@@ -21,8 +21,6 @@ def make_world(self, batch_dim: int, device: torch.device, **kwargs):
         self.max_speed_1 = kwargs.pop("max_speed_1", None)  # 0.05
         ScenarioUtils.check_kwargs_consumed(kwargs)
 
-        self.pos_shaping_factor = 1
-
         self.n_agents = 2
 
         self.wall_length = 2