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Fix T67259 : Auto depth not working with multires in sculpt mode

Basically the solution is to call `DRW_shgroup_call_sculpt` when `BKE_sculptsession_use_pbvh_draw(...)` is true.

Ref T67259

Reviewers: fclem, jbakker, brecht

Reviewed By: fclem, brecht

Maniphest Tasks: T67259

Differential Revision: https://developer.blender.org/D5396