Fix SPI communication problem in Sample2-Complex
Fix SPI communication problem in Sample2-Complex

The Arduboy2 library switched from using the Arduino SPI.transfer()
function to its own SPItransfer() function. This caused compile errors
with the Sample2-Complex example sketch, which sent commands to the
display using the old method. The Arduboy2 SPItransfer() function is
now used.

igvina/ArdVoice