fix: no use sad pattern on happy arm with guard

[A4-Tacks]

For replace_if_let_with_match assist

Example

fn foo(x: Option<i32>) {
    $0if let Some(x) = x && x != 4 {
        println!("{}", x)
    } else {
        println!("none")
    }
}

Before this PR

fn foo(x: Option<i32>) {
    match x {
        Some(x) if x != 4 => println!("{}", x),
        None => println!("none"),
    }
}

After this PR

fn foo(x: Option<i32>) {
    match x {
        Some(x) if x != 4 => println!("{}", x),
        _ => println!("none"),
    }
}