Blender Git Loki

Fix T75662: Surface Smooth filter not checking face sets

In the main mesh filter loop vertex that do not have the active face set
are skipped, so in the following surface smooth displacement loop these
vertices were deformed using an uninitialized laplacian_disp value.
Now the main loop initializes the laplacian_disp for all vertices and
the deformation based on face sets is skipped in the second loop.

Reviewed By: jbakker

Maniphest Tasks: T75662

Differential Revision: https://developer.blender.org/D7443