Blender Git Loki

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