Fix RequestParameter functional test

One or two tests from com.forgerock.openam.functionaltest.oauth2.openidconnect.requestparameter.RequestParameter appear to have been broken by the recent JWT encryption work for elastic SAML. It's not possible to simply revert the suspected commit as there is other code on master dependent upon it.

Tests are

When an invalid JWT is sent -> when request parameter cannot be decrytped -> RequestParameter informs the resource owner of an invalid_request_object error.

When the request is syntactically incorrect -> when the redirect url in the request is incorrect -> RequestParameter won't use the incorrect redirect url