fdo#74702 update bad advise in comment in DrawTransparentNatively()

We really do *not* want to introduce the horror that is meOutDevType
into our code. If we need to stop the Printer class from drawing a
PolyPolygon then we should let Printer do this, not make OutputDevice
make this decision on Printer's behalf!

Change-Id: If74eccdf34688ce1164da2bb705ea48eefc18800