fixed ezuhf file (valid if ppm pulse_type fix for stm32 merged).

Because pulse_type in radio files wasn't working on stm32 files, the ppm recognizer seemed to skip the first channel (roll), because ezuhf sends ppm on falling edge. In my setup I copied channel 1 to channel 6 as a workaround. If the ppm pulse_type issue is fixed, this update can be merged as well so that one more channel becomes available.