False positive with type_repetition_in_bounds and generics

`type_repetition_in_bounds` seems missed generics in types.

```rust
#![allow(dead_code)]
#![warn(clippy::type_repetition_in_bounds)]

pub struct Foo<A>(A);

pub struct Bar<A, B> {
    a: Foo<A>,
    b: Foo<B>,
}

impl<A, B> Unpin for Bar<A, B>
where
    Foo<A>: Unpin,
    Foo<B>: Unpin, //~ WARN this type has already been used as a bound predicate
{
}
```