Fix axis label on impedance graph and clear steps when protocol changes
Fix axis label on impedance graph and clear steps when protocol changes

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