Sculpting: Remove Show Diffuse Color Option

This should have been removed in 2.80 as the functionality was removed.
This feature now does not do anything and can be removed.

Differential Revision: https://developer.blender.org/D5411

release/scripts/startup/bl_ui/space_view3d.py

@@ -2862,7 +2862,6 @@ class VIEW3D_MT_sculpt(Menu):
         layout.prop(sculpt, "show_low_resolution")
         layout.prop(sculpt, "show_brush")
         layout.prop(sculpt, "use_deform_only")
-        layout.prop(sculpt, "show_diffuse_color")
         layout.prop(sculpt, "show_mask")
 
 
@@ -5760,8 +5759,6 @@ class VIEW3D_PT_overlay_sculpt(Panel):
         view = context.space_data
         overlay = view.overlay
 
-        layout.prop(sculpt, "show_diffuse_color")
-
         row = layout.row(align=True)
         row.prop(sculpt, "show_mask", text="")
         sub = row.row()