rhoReactingFoam: Updated to use the latest UEqn.H from reactingFoam

applications/solvers/combustion/reactingFoam/rhoReactingFoam/pEqn.H

@@ -5,11 +5,11 @@
     // pressure solution - done in 2 parts. Part 1:
     thermo.rho() -= psi*p;
 
-    volScalarField rAU(1.0/UEqn.A());
+    volScalarField rAU(1.0/UEqn().A());
     surfaceScalarField rhorAUf("rhorAUf", fvc::interpolate(rho*rAU));
 
     volVectorField HbyA("HbyA", U);
-    HbyA = rAU*UEqn.H();
+    HbyA = rAU*UEqn().H();
 
     if (pimple.transonic())
     {