simplifiedSiwek: Temporarily define all gaseous species to be present

This hack will be removed when the rewrite of the parcel thermodynamics is complete.

tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/coalCloud1Properties

@@ -142,6 +142,11 @@ subModels
                 CH4             0.604;
                 H2              0.099;
                 CO2             0.297;
+
+                // Temporarily add entries for remaining gas species
+                N2  0;
+                O2  0;
+                H2O 0;
             }
             liquid
             {