Altitude hold bug fix - changed g.throttle_cruise to be updated to steal I term from correct controller

ArduCopter/ArduCopter.pde

@@ -1280,14 +1280,14 @@ adjust_altitude()
 		// we remove 0 to 100 PWM from hover
 		manual_boost = g.rc_3.control_in - 180;
 		manual_boost = max(-120, manual_boost);
-		g.throttle_cruise += g.pi_alt_hold.get_integrator();
+		g.throttle_cruise += g.pi_throttle.get_integrator();
 		g.pi_alt_hold.reset_I();
 		g.pi_throttle.reset_I();
 
 	}else if  (g.rc_3.control_in >= 650){
 		// we add 0 to 100 PWM to hover
 		manual_boost = g.rc_3.control_in - 650;
-		g.throttle_cruise += g.pi_alt_hold.get_integrator();
+		g.throttle_cruise += g.pi_throttle.get_integrator();
 		g.pi_alt_hold.reset_I();
 		g.pi_throttle.reset_I();