shapekeys/modifiers
This was failing for all mask filters (sharpen, grow, invert, clear,
shrink, contrast, smooth) and mask gestures (box, lasso).
Also have to recalc shading, use SCULPT_tag_update_overlays for this.
ref D8956
Maniphest Tasks: T81929
Differential Revision: https://developer.blender.org/D9302