MT32: Comment out default showLCDMessage/printDebug implementations.

This keeps the original MUNT code in showLCDMessage/printDebug and simply
comments it out. This *silences* a warning about debug use in our former
default replacement code. Since we already implement a ReportHandler there
is no need to adapt the default implementation.

This is not the cleanest way but the solution which requires the least changes
to MUNT code.