Increase MAX_FRAME_SIZE by 4 bytes #653

Job	Run time
build (RAK_4631_companion_radio_ble)	2m 26s
build (Heltec_v3_companion_radio_ble)	2m 42s
build (PicoW_repeater)	2m 28s
build (Heltec_v3_room_server)	2m 42s
build (RAK_4631_room_server)	2m 45s
build (RAK_4631_repeater)	2m 17s
build (Heltec_v3_repeater)	2m 48s
build (wio-e5-mini_repeater)	1m 29s
build (LilyGo_Tlora_C6_repeater_)	1m 55s
	21m 32s

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