Followup to 80f5b3ad21 which was just
plain wrong. Somehow I missed the whole point and set auto handle types
instead of aligned. In a more thorough dive into this area, there was
some weird structural decisions making things harder than they should be.
This commit slightly simplifies the way the first and last handle of a
segment are set, moving it all to happen in one place and making the
processing of the last cyclic segment a bit simpler. The resulting
handles are aligned if possible.
Pull Request: https://projects.blender.org/blender/blender/pulls/133070
78090a0ce5