Fixed skip validation in handleResponse

[riviar]

Changed skip validation check in
AbstractWsSecurityInterceptor#handleResponse to look for optional
security header in response, instead of request

[riviar]

By some odd test behaviour I have found that, when handling response, skipValidationIfNoHeaderPresent check looks for security header in request, instead of response. Which is likely an unintended behaviour. This small fix changes the check to verify actual message being handled.

[gregturn]

Thanks @riviar!