Modifed VeloMotion file for PbPb 2018

Elisabeth Maria Nielrequested to merge
niel-PbPb2018-SMOG into Sim09/2018-PbPb-PbNe

VeloMotion file with updated values for PbPb2018 from fit to 2018 MagDown data. To be merged to Sim09/2018 for PbPb and Pb-Ne simulation.

Edited by Liang Sun

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