Blender Git Loki

Workbench: World Space Cavity

When using the world space cavity shader together with viewport or image
rendering only a single pattern was used. This was that the iteration of
the cavity shader was updated when the cache is initialized.

Now the cavity iteration is updated together when the TAA samples are
updated.

Reviewed By: fclem

Differential Revision: https://developer.blender.org/D5021