repeater: poweroff on long press #1827

Job	Run time
build (Heltec_v3_repeater)	3m 9s
build (RAK_4631_repeater)	2m 30s
build (Heltec_v3_companion_radio_ble)	2m 51s
build (wio_wm1110_repeater)	2m 23s
build (LilyGo_Tlora_C6_repeater_)	2m 10s
build (Heltec_v3_room_server)	2m 46s
build (RAK_4631_companion_radio_ble)	2m 25s
build (RAK_4631_room_server)	2m 21s
build (wio-e5-mini_repeater)	1m 47s
build (Tbeam_SX1276_repeater)	2m 4s
build (PicoW_repeater)	2m 41s
	27m 7s

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