Sculpt: Fix slide relax cursor color

Slide/Relax is a deform tool, so the color should be yellow.

Reviewed By: brecht

Differential Revision: https://developer.blender.org/D6827

source/blender/blenkernel/intern/brush.c

@@ -1063,6 +1063,7 @@ void BKE_brush_sculpt_reset(Brush *br)
     case SCULPT_TOOL_ROTATE:
     case SCULPT_TOOL_ELASTIC_DEFORM:
     case SCULPT_TOOL_POSE:
+    case SCULPT_TOOL_SLIDE_RELAX:
       br->add_col[0] = 1.0f;
       br->add_col[1] = 0.95f;
       br->add_col[2] = 0.005f;