Fix undersaturatd viscosity table

Data is now correctly read from ununderdatTable instead of pvtgTable

opm/core/props/pvt/SinglePvtLiveGas.cpp

@@ -99,7 +99,7 @@ namespace Opm
             undersat_gas_tables_[i].resize(3);
             undersat_gas_tables_[i][0] = undersatTable.getOilSolubilityColumn();
             undersat_gas_tables_[i][1] = undersatTable.getGasFormationFactorColumn();
-            undersat_gas_tables_[i][2] = pvtgTable.getOuterTable()->getGasViscosityColumn();
+            undersat_gas_tables_[i][2] = undersatTable.getGasViscosityColumn();
         }
     }