Wrong trait bounds generated for `Eq`

With educe 0.6.0,

```rust
#[derive(educe::Educe)]
#[educe(PartialEq, Eq)]
pub struct Foo<T>(T);
```

results in:

```rust
impl<T> ::core::cmp::PartialEq for Foo<T> where T: ::core::cmp::PartialEq { ... }
impl<T> ::core::cmp::Eq for Foo<T> where T: ::core::cmp::PartialEq {}
```

This `impl<T> Eq for Foo<T> where T: PartialEq` looks wrong.