Curve: Remove duplicated and confusing argument

Curve function had two arguments:

- for_render, which was originally supposed to be used to control
  whether viewport or render visibility for modifiers is to be
  used.

- use_render_resolution, which sounds like it is supposed to control
  whether viewport or render resolution for curves is to be used.

What is totally confusing is that those arguments were used
interchangeably: sometimes use_render_resolution would control
modifiers visibility.

This commit makes it so there is one single argument for this.

Reviewers: brecht

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D4850

source/blender/blenkernel/BKE_curve.h

@@ -143,7 +143,6 @@ void BKE_curve_bevel_make(struct Depsgraph *depsgraph,
                           struct Object *ob,
                           struct ListBase *disp,
                           const bool for_render,
-                          const bool use_render_resolution,
                           struct LinkNode *ob_cyclic_list);
 
 void BKE_curve_forward_diff_bezier(