NDOF: Removed impact of the auto orbit center on Fly Mode

Remove the impact of Auto orbit center preference onto Fly mode.
Until now, it was possible to experience dynamic translation speed
changes in the Fly mode with Auto preference enabled for the orbit
center. This was not desired.

Ref !141035

source/blender/editors/space_view3d/view3d_navigate_view_ndof.cc

@@ -419,6 +419,9 @@ void view3d_ndof_fly(const wmNDOFMotionData &ndof,
 
 static bool ndof_orbit_center_is_auto(const View3D *v3d, const RegionView3D *rv3d)
 {
+  if (!NDOF_IS_ORBIT_AROUND_CENTER_MODE(&U)) {
+    return false;
+  }
   if ((U.ndof_flag & NDOF_ORBIT_CENTER_AUTO) == 0) {
     return false;
   }