Blender Git Loki

Nodes: match Multi-input socket activation distance

Activation distance for multi input sockets had different length
dependend of dpi factor. That caused jumping when activation distance
became shorter than snapping distance.

Fixed by removing activation distance and using same function
which is used to evaluate snapping.

Reviewer: Dalai Felinto

Differential Revision: https://developer.blender.org/D10809