Blender Git Loki

Fix T60044: Sculpting brush is not visible on file load

The original issue is that wm->paintcursors is empty until we go in and
out of the sculpt mode. To fix this we need to toggle inside the sculpt
mode.

This is usually tackled by ED_editors_init(), however the sculpt mode
toggling was never call because the object technically had "mode data".

Reviewers: campbellbarton

Differential Revision: https://developer.blender.org/D4153