fix: remove avoidance field from boid properties as it was accidentally included

rust/src/boid/boid_properties.rs

@@ -31,8 +31,4 @@ pub struct BoidProperties {
     #[init(val = 0.8)]
     /// How much to follow a flock target (if there is one).
     pub targeting: f32,
-    #[export]
-    #[init(val = 1.0)]
-    /// How much to avoid avoidance objects (if there are any).
-    pub avoidance: f32,
 }