Fix suggestion of unused variables with raw identifier in struct pattern
This MR fixes a broken lint suggestion that occurs when a struct pattern contains an unused variable written with a raw identifier.
In the following fragment, `r#move` is an unused variable. The compiler suggested to change it to `move: _` which doesn’t compile since move is a keyword. This change makes it so that the suggestion becomes `r#move: _`
```rust
struct Foo {
r#move: u32
}
fn bar(foo: Foo) -> u32 {
match foo {
Foo { r#move } => 0
}
}
```
r? JonathanBrouwer
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