revert complicated div thingy to original scheme

because of error

openfoam2012/freeCylinderFlow/system/fvSchemes

@@ -39,7 +39,7 @@ divSchemes
     div(phi,epsilon) $turbulence;
     div(phi,omega)  $turbulence;  // error was that this was missing. Just do the same as with the other div(phi,...)...
 
-    div((nuEff*dev2(T(grad(U))))) $turbulence; // to have the same everywhere Gauss linear;
+    div((nuEff*dev2(T(grad(U))))) Gauss linear;
 }
 
 laplacianSchemes