tauRecTools: retrieve clusters via decoration

Previously, we use GetJetClusterList in HelperFunctions to retrieve the cluster list from seed jet, and then apply the tau vertex correction by a tool, i.e. TauVertexCorrection. Since the clusters with four momentum corrected to point at tau vertex are already decorated onto the tau candidate, we could retrieve these clusters directly. GetJetClusterList and TauVertexCorrection are obsolete, thus removed.