Fix curl_copy_handle() with CURLINFO_HEADER_OUT

The CURLOPT_DEBUGDATA will point to the old curl handle after
copying. Update it to point to the new handle.

We don't separately

Fix curl_copy_handle() with CURLINFO_HEADER_OUT

The CURLOPT_DEBUGDATA will point to the old curl handle after
copying. Update it to point to the new handle.

We don't separately store whether CURLINFO_HEADER_OUT is enabled,
so I'm doing this unconditionally. It should be harmless if
CURLOPT_DEBUGFUNCTION is not used.

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