TPCQC: fix for magnitude of charge with TPC mom for dEdx for He3 plots

Author: Bhawani Singh

Detectors/TPC/qc/src/PID.cxx

@@ -131,7 +131,8 @@ bool PID::processTrack(const o2::tpc::TrackTPC& track, size_t nTracks)
 {
   // ===| variables required for cutting and filling |===
   const auto& dEdx = track.getdEdx();
-  const auto pTPC = track.getP();
+  const auto magCharge = track.getAbsCharge();
+  const auto pTPC = track.getP() * magCharge; // charge magnitude is divided getP() via getPtInv therefore magCharge is required to be multiplied [fix for He3]
   const auto tgl = track.getTgl();
   const auto snp = track.getSnp();
   const auto phi = track.getPhi();