tdf#84881: Set TimeStampReq::certReq to true

I think Adobe Reader expects the timestamp info to include the TSA's
certificate.

Change-Id: Iedf1c4a9952b12ac61b4ba7f73bee339480e821d

vcl/source/gdi/pdfwriter_impl.cxx

@@ -6796,9 +6796,9 @@ bool PDFWriterImpl::finalizeSignature()
         src.nonce.data = reinterpret_cast<unsigned char*>(&nNonce);
         src.nonce.len = sizeof(nNonce);
 
-        src.certReq.type = siBuffer;
-        src.certReq.data = NULL;
-        src.certReq.len = 0;
+        src.certReq.type = siUnsignedInteger;
+        src.certReq.data = &cOne;
+        src.certReq.len = sizeof(cOne);
 
         src.extensions = NULL;