AC_WPNav: add floating point constant designators

libraries/AC_WPNav/AC_Loiter.cpp

@@ -129,8 +129,8 @@ void AC_Loiter::init_target()
     // update angle targets that will be passed to stabilize controller
     float roll_cd, pitch_cd;
     _pos_control.accel_to_lean_angles(_predicted_accel.x, _predicted_accel.y, roll_cd, pitch_cd);
-    _predicted_euler_angle.x = radians(roll_cd*0.01);
-    _predicted_euler_angle.y = radians(pitch_cd*0.01);
+    _predicted_euler_angle.x = radians(roll_cd*0.01f);
+    _predicted_euler_angle.y = radians(pitch_cd*0.01f);
     // set target position
     _pos_control.set_xy_target(curr_pos.x, curr_pos.y);