tdf#114819 - include the synthetic encrpytion header into the size.

Change-Id: I090347046725a1ebb7a36f465654c29f7443d20d
Reviewed-on: https://gerrit.libreoffice.org/47467Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>

package/source/zipapi/XUnbufferedStream.cxx

@@ -102,6 +102,7 @@ XUnbufferedStream::XUnbufferedStream(
         sal_Int8 * pHeader = maHeader.getArray();
         ZipFile::StaticFillHeader( rData, rEntry.nSize, aMediaType, pHeader );
         mnHeaderToRead = static_cast < sal_Int16 > ( maHeader.getLength() );
+        mnZipSize += mnHeaderToRead;
     }
 }