Blender Git Loki

Remove the code in `BKE_collection_move` to preserve LayerCollection flags.

This code was actually buggy (forcefully re-enabling excluded layers in some
cases).

Further more, it should not be needed now that layerCollection resync code
reuses as much as possible existing layers instead of deleting and
re-creating them all the time.

Differential Revision: https://developer.blender.org/D12016