When sculpting and doing a image render the workbench used the sculpt batch what is created by a different GPU context and would not show up. In debug builds an assert for this case is checked. I rechecked all `use_sculpt_pbvh` that it also checked if it was rendering. Only the workbench deferred didn't do this for the default render mode. With this change the user can render a workbench render directly from sculpt mode.