Blender Git Loki

Clay Strips: Set default normal radius to 1.55

The previous default was 1.7, so the brush was more stable on surface
normal changes, but softer. I don't think users expect this brush to be
that stable, so by using 1.55 we make the brush a little bit stronger on
curved surfaces by default.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D6187