Cannot use parallel iterators with `changed` filter

The following program:

```rust
use legion::prelude::*;

fn main() {
let mut world = World::new();
>::query()
.filter(changed::())
.par_for_each_mut(&mut world, |_| ());
}
```

fails to compile with:

```
error[E0277]: the trait bound `legion_core::filter::ComponentChangedState<'_, legion_core::storage::ComponentStorage>: legion_core::iterator::FissileIterator` is not satisfied
--> src/main.rs:7:10
|
7 | .par_for_each_mut(&mut world, |_| ());
| ^^^^^^^^^^^^^^^^ the trait `legion_core::iterator::FissileIterator` is not implemented for `legion_core::filter::ComponentChangedState<'_, legion_core::storage::ComponentStorage>`

error: aborting due to previous error

```

This issue seems to have been introduced in c99326e6ced5a8d359574ced878eb97fddb9d227.