windows-bindgen doesn't error on unused filters

[kennykerr]

Summary

We don't have a failure test for this scenario so this slipped in at some point.

Crate manifest

[build-dependencies.windows-bindgen]
version = "0.58"

Crate code

fn main() {
    windows_bindgen::bindgen(["--out", "src/bindings.rs", "--filter", "Not.Found"]).unwrap();
}