Blender Git Loki

Fix T73070: Disable falloff_shape in the Pose Brush

The Falloff property in the pose brush controls how much deformation
propagates through the ik chain, not by using the distance to the
vertices, so this option does not make sense (it does nothing in the
pose brush code and it disables the 3d paint cursor).

Reviewed By: jbakker

Maniphest Tasks: T73070

Differential Revision: https://developer.blender.org/D6574