Fix mapping of series resistor selection pins for hardware version 2.1
Fix mapping of series resistor selection pins for hardware version 2.1

wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf-control-board-firmware,wheeler-microfluidics/dmf_control_board_plugin,wheeler-microfluidics/dmf-control-board-firmware