Remove the last uses of `BKE_boundbox_init_from_minmax` in favor of the newer `bounds::corners`. Besides clearer naming and better ergonomics, it's also inline-able which seems to be a good thing for such a simple function. In order to get the same behavior as before I changed the C++ bounds function to give the same vertex order as the older function. Pull Request: https://projects.blender.org/blender/blender/pulls/140401