tecs.cpp: tecs initialisation fixes (#411)

- zero thrust integrator on initialisation, we already have a cruise throttle
variable
- if initialising from in_air condition set last throttle setpoint to
cruise throttle (_in_air ? throttle_cruise : 0.0f);

tecs/tecs.cpp

@@ -522,9 +522,9 @@ void TECS::_initialize_states(float pitch, float throttle_cruise, float baro_alt
 		_vert_pos_state = baro_altitude;
 		_tas_rate_state = 0.0f;
 		_tas_state = _EAS * EAS2TAS;
-		_throttle_integ_state = (_in_air ? throttle_cruise : 0.0f);
+		_throttle_integ_state =  0.0f;
 		_pitch_integ_state = 0.0f;
-		_last_throttle_setpoint = throttle_cruise;
+		_last_throttle_setpoint = (_in_air ? throttle_cruise : 0.0f);;
 		_last_pitch_setpoint = constrain(pitch, _pitch_setpoint_min, _pitch_setpoint_max);
 		_pitch_setpoint_unc = _last_pitch_setpoint;
 		_hgt_setpoint_adj_prev = baro_altitude;