GeoSpecialShapes: cleanup debug printout in LArWheelCalculator
The fill_sincos_parameterization of LArWheelCalculator_Impl had some
(partially) disabled code for debug printing. But some of the code was
still compiled and executed even during regular builds. Put the entire
section behind the DEBUGPRINT macro. This is also what the FIXME
comment indicated to be the correct thing to do.