remove residual code for mesh_sds_timeout_secs

[andrekir]

    if (config.power.sds_secs != UINT32_MAX)
        powerFSM.add_timed_transition(lowPowerState, &stateSDS, getConfiguredOrDefaultMs(config.power.sds_secs), NULL,
                                      "mesh timeout");

was originally:

firmware/src/PowerFSM.cpp

Lines 358 to 359 in 9481461

	if (meshSds != UINT32_MAX)
	powerFSM.add_timed_transition(lowPowerState, &stateSDS, meshSds * 1000, NULL, "mesh timeout");