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

source/blender/blenkernel/intern/brush.c

@@ -928,7 +928,7 @@ void BKE_brush_sculpt_reset(Brush *br)
     case SCULPT_TOOL_CLAY_STRIPS:
       br->flag |= BRUSH_ACCUMULATE;
       br->alpha = 0.7f;
-      br->normal_radius_factor = 1.7f;
+      br->normal_radius_factor = 1.55f;
       br->curve_preset = BRUSH_CURVE_SPHERE;
       br->spacing = 6;
       break;