Fix reference alias for FTag IPxTaggers for VR jets in derivation
Fixes the reference file alias to be used by IPxD taggers for the VR track jet collection. With this MR, BTagging_AntiKtVR30Rmax4Rmin02TrackAuxDyn.IP2D_pb distribution is filled (using the same reference as for PFlow)
Tagging @cschiavi @vdao @biliu @mguth @fdibello @dguest @thuffman @pgadow for FTAG
Edited by Arnaud Duperrin