AC_WPNav: init_loiter_target always resets I term

This was only used by poshold and this has been removed as part of "new-loiter"

libraries/AC_WPNav/AC_WPNav.cpp

@@ -170,7 +170,7 @@ AC_WPNav::AC_WPNav(const AP_InertialNav& inav, const AP_AHRS_View& ahrs, AC_PosC
 ///
 
 /// init_loiter_target in cm from home
-void AC_WPNav::init_loiter_target(const Vector3f& position, bool reset_I)
+void AC_WPNav::init_loiter_target(const Vector3f& position)
 {
     // initialise pos controller speed, acceleration
     _pos_control.set_speed_xy(WPNAV_LOITER_VEL_CORRECTION_MAX);

libraries/AC_WPNav/AC_WPNav.h

@@ -73,8 +73,7 @@ public:
     ///
 
     /// init_loiter_target to a position in cm from ekf origin
-    ///     caller can set reset_I to false to preserve I term since previous time loiter controller ran.  Should only be false when caller is sure that not too much time has passed to invalidate the I terms
-    void init_loiter_target(const Vector3f& position, bool reset_I=true);
+    void init_loiter_target(const Vector3f& position);
 
     /// init_loiter_target - initialize's loiter position and feed-forward velocity from current pos and velocity
     void init_loiter_target();