turbulenceModels/RAS/v2f: removed the fvOptions source from the f-equation

It is not clear what form an fvOptions source should take as f is not a
transported dynamic field. For the moment the fvOptions source from the
f-equation has been removed until there is a specific need which will
show what the form should be.

Resolves bug-report http://www.openfoam.org/mantisbt/view.php?id=1955

src/TurbulenceModels/turbulenceModels/RAS/v2f/v2f.C

@@ -364,7 +364,6 @@ void v2f<BasicTurbulenceModel>::correct()
      ==
       - fvm::Sp(1.0/L2, f_)
       - 1.0/L2/k_*(v2fAlpha - C2_*G)
-      + fvOptions(alpha, rho, f_)
     );
 
     fEqn().relax();