reduce false positives from wrapper assert calls

[GrosQuildu]

Functions that are wrappers around assert statements are likely to be marked by necessist, but are always false positives. For example, in rust:

#[test]
fn test_something() {
   assert_normalizes("abcd", "def1");
}

fn assert_normalizes(sig_hex: String, expected_hex: String) {
    let sig = decode(&sig_hex).unwrap();
    let normalized_sig = normalize_ecdsa(sig).unwrap();
    assert_eq!(encode(&normalized_sig), expected_hex);
}

Removal of assert_normalizes should not be important. Heuristic for the improvement would be to not mark functions that have standard assert statements and do not modify global values.