Blender Git Loki

Fix T81904: Cloth brush simulation failing with local area and mirror

When using local area, all nodes need to build their constraints first
before activating them for simulation. THis ensures that nodes get their
structural constraints from the initial location of each symmetry pass.

Reviewed By: sergey

Maniphest Tasks: T81904

Differential Revision: https://developer.blender.org/D9303