[open-beos-printing] Minor Issues

There appear to be some comments that need to be adjusted.

Halftone.cpp is commented as being HalftoneEngine.cpp
src/add-ons/print/drivers/shared/libprint/Halftone.cpp

Halftone.h is commented as being HalftoneEngine.h
/headers/private/print/Halftone.h

BeUtils.h is commented as being BeUtils.cpp
/headers/private/print/BeUtils.h

Curtis


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