made resetting throttle cruise a function

ArduCopter/ArduCopter.pde

@@ -1877,17 +1877,11 @@ 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.pi_alt_hold.reset_I();
-		g.pi_throttle.reset_I();
-
+		update_throttle_cruise();
 	}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.pi_alt_hold.reset_I();
-		g.pi_throttle.reset_I();
-
+		update_throttle_cruise();
 	}else {
 		manual_boost = 0;
 	}