queries(rust): highlight function parameter locals in more places

[nik-rev]

test file:

fn x((a, b): !) {
    foo(a, b);
}
fn x(a: !, mut b: !) {
    foo(a, b);
}
fn x((a, mut b): !, mut b: !) {
    foo(a, b);
}
fn x(foo::TupleStruct(a, mut b): !) {
    foo(a, b);
}
fn x(foo::NamedStruct { a, mut b }: !) {
    foo(a, b);
}
fn x(bar::Struct(mut a, b): !) {
    foo(a, b);

    // just to test that it works with closures too
    let m = |bar::Struct(mut c, d): !| {
        bar(c, d);
    };
}
fn x([a, mut b]: !) {
    foo(a, b);
}

split up from #13932