Remove debug leftovers that were causing memory corruption. Writes of 64 or more bytes from the USB host side caused memory corruption before this commit. I've tested it in a STM32L4 board and it is working as expected.
Examples in these directories are not only for the board listed, they are simply preconfigured for those boards. If you do not find an example of the peripheral you want to use listed for your board, please look at the other boards. The differences between boards for the examples is normally only LEDs and buttons on different pins, and different memory sizes.