b166fa46b8
When writing an Action to a blend file, for forward compatability reasons the animation data in the first slot is also written to the old Animato Action storage locations. That way, loading the Action in an older version of Blender will still at least have that animation data. However, we overlooked `Action.idroot`, which indicates which ID type the Action is for, and therefore all Actions have an unspecified `idroot` when loaded in pre-layered-action versions of Blender. This PR fixes that by also setting the `idroot` to match the target ID type of the first slot when writing to disk. Pull Request: https://projects.blender.org/blender/blender/pulls/133819
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