= cppm_none as default (instead of cppm_open9x)
- the cppm isr will track for the sync gap and set the sync flag after the last channel in the train/group (just before the pulse)

= ui clean up for dump_sensor()

= fixed bug with extra att_hold local var, which prevented att_hold mode from enabling with non cppm rx input. (att_hold || aux2_in2 > 1700) always always since local copy is always false.