fix: destroy prebound parts on model drop

Signed-off-by: Schmarni <marnistromer@gmail.com>

src/nodes/drawable/model.rs

@@ -651,6 +651,11 @@ impl Drop for Model {
 				node.destroy();
 			}
 		}
+		for p in self.pre_bound_parts.lock().iter() {
+			if let Some(node) = p.spatial.node() {
+				node.destroy();
+			}
+		}
 		MODEL_REGISTRY.remove(self);
 	}
 }