Curves: Disable draw tool radius preview

Currently user feedback suggests this overlay is getting in the way
more often then not, since it is usually quite large compared to the
scale of the model. In the future it could be enabled/disabled based
on the "strand/strip" display option, which is planned to move to
objects instead of the scene in the future. However, until then, it
seems better to disable the preview.

source/blender/editors/curves/intern/curves_draw.cc

@@ -341,7 +341,9 @@ static void curve_draw_stroke_3d(const bContext * /*C*/, ARegion * /*region*/, v
 
   Object *obedit = cdd->vc.obedit;
 
-  if (cdd->bevel_radius > 0.0f) {
+  /* Disabled: not representative in enough cases, and curves draw shape is not per object yet.
+   * In the future this could be enabled when the object's draw shape is "strand" or "3D".*/
+  if (false && cdd->bevel_radius > 0.0f) {
     BLI_mempool_iter iter;
     const StrokeElem *selem;