limit tx power to LORA_ MAX_TX_POWER #37

Job	Run time
build (RAK_4631_repeater)	2m 30s
build (PicoW_repeater)	2m 56s
build (RAK_4631_room_server)	2m 21s
build (wio-e5-mini_repeater)	1m 55s
build (Heltec_v3_room_server)	2m 46s
build (LilyGo_Tlora_C6_repeater_)	2m 2s
build (RAK_4631_companion_radio_ble)	2m 32s
build (Heltec_v3_companion_radio_ble)	2m 47s
build (Heltec_v3_repeater)	2m 50s
	22m 39s

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