Caused by #113504
The `type` property has been removed from the operator,
but of course that is a breaking change in 4.1.
(e.g. reported here: #117547)
At the time of making the patch,
I wasn't sure how to handle all cases but it turns out its not complicated.
I've added back the property with the following logic.
* Try to get the `KeyingSet` from the `type`.
* `type` defaults to 0 which means the `ANIM_keyingset_get_from_enum_type`
will get it from the scene.
* If the scene doesn't have one, or a valid index isn't passed in the `KeyingSet`
will be a `nullptr` in which case it inserts from the user preferences.
Pull Request: https://projects.blender.org/blender/blender/pulls/117718
b2aa36485b