message: Rewrite one instance of `Result::is_ok()`
  Closes:
  Approved by: metajack
diff: @@ -68,10 +68,7 @@ pub fn native_ed25519_signature_verification(mut arguments: VecDeque<Value>) ->
  }
  };
  - let bool_value = match sig.verify_arbitrary_msg(msg.as_bytes(), &pk) {
  - Ok(()) => true,
  - Err(_) => false,
  - };
  + let bool_value = sig.verify_arbitrary_msg(msg.as_bytes(), &pk).is_ok();
  let return_values = vec![Value::bool(bool_value)];
  NativeReturnStatus::Success {
  cost,
  