Make trk_sv_info and track_truth_info accessible also when using SingleBTagAlg.cxx
requested to merge mtanasin/training-dataset-dumper:feature_add_track_SV_truth_Info_Athena_mtanasin into r22
The possibility to decorate tracks with information about their true origin and their use in the secondary vertex had been added for users of dump-single-btag.cxx but not for users of SingleBTagAlg.cxx (those wishing to run with Athena). Taking inspiration from the changes made to dump-single-btag.cxx, I updated SingleBTagAlg.cxx so that it is allows to decorate tracks with the new information.