Fixes Bug 395605

If you take a clone layer or a vector layer and convert it to a paint layer, Krita will select the layer below instead of the converted layer.

Make a clone layer and convert it to a paint layer. See what layer is selected in the layer docker

Make a vector layer and convert it to a paint layer. See what layer is selected in the layer docker

I tried testing it in a group layer as well so it is nested, and it seemed to work ok there.