mod_ssl: follow up to r1583191.

Use type BOOL for modssl_ctx_t's field ocsp_use_request_nonce.
Suggested by: kbrand.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1591401 13f79535-47bb-0310-9956-ffa450edef68