Move XEnumerationAccess Java test to C++ for ScDataPilotFieldsObj.

Change-Id: I4b8bf204ccf4229ee5c57c03caef9fa5459e28a8
Reviewed-on: https://gerrit.libreoffice.org/67269
Tested-by: Jenkins
Reviewed-by: Jens Carl <j.carl43@gmx.de>