remove line that doesn't do anything

Author: mari2895

src/radiation/cooling_function.cpp

@@ -42,8 +42,6 @@ TaskStatus LightBulbCalcTau(MeshBlockData<Real> *rc) {
   auto &unit_conv =
       pmesh->packages.Get("phoebus")->Param<phoebus::UnitConversions>("unit_conv");
   const Real density_conversion_factor = unit_conv.GetMassDensityCodeToCGS();
-
-  pmesh->packages.Get("phoebus")->Param<phoebus::UnitConversions>("unit_conv");
   parthenon::par_for(
       DEFAULT_LOOP_PATTERN, "CalcTau", DevExecSpace(), kb.s, kb.e, jb.s, jb.e, ib.s, ib.e,
       KOKKOS_LAMBDA(const int k, const int j, const int i) {