If you use .insert on Write<StorageCollider> you might cause a unwrap() to fail

[tom-leys]

1. Create a collider and do a tick
2. Replace that with a new collider using Write<StorageCollider>::insert -- Modify event is created by Specs, not Remove and insert --
3. let collider_handle = physics_collider.handle.unwrap(); - This line in sync_colliders_to_physics (update_collider) will panic

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Workaround, Use Write<StorageCollider>::remove first.