Small but important changes.

Small but
important changes to schematics:
In MegaDrum32 Digital board: R26 - from 220
to 4k7
In MegaDrum8 Digital board: R21 - from 220 to 4k7
In AVR-CDC USB
board: R4 - from 470 to 1k
In PIC18F2550 USB board: R4 - from 470 to
1k
With old values MegaDrum might experience resets when receiving Sysex
configs.