fix(engine_multiscale): resolved bug which prevented proper equilibrium abundances from being found

this was done by adjusting the scaling of the QSE operator() residuals from r = dy/dt to r=(dy/dt)/y

src/include/gridfire/reaction/reaction.h

@@ -728,6 +728,7 @@ namespace gridfire::reaction {
                        rate.a5 * T953 +
                        rate.a6 * logT9;
                 sum += CppAD::exp(exponent);
+                // return sum; // TODO: REMOVE THIS ITS FOR TESTING ONLY
             }
             return sum;
         }