concept-response-clone: Ensure header guard is cloned after headers

https://fetch.spec.whatwg.org/#concept-response-clone

If the header guard of the response to clone is `immutable`, then copying the headers to the new response will fail with `Guard is immutable` unless we ensure the guard is copied _after_ the headers.

https://github.com/servo/servo/blob/8650794391729c6fee34bc2644ccbb85bd8fd58d/components/script/dom/response.rs#L331-L334

    fn Append(&self, name: ByteString, value: ByteString) -> ErrorResult {
        // Step 1
        let value = normalize_value(value);
        // Step 2
        let (mut valid_name, valid_value) = validate_name_and_value(name, value)?;
        valid_name = valid_name.to_lowercase();
        // Step 3
        if self.guard.get() == Guard::Immutable {
            return Err(Error::Type("Guard is immutable".to_string()));
        }

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