469762fb6b
Avoid looping over all F-Curves in `bke::action_foreach_id()`. This was only necessary to support the possible ID* in custom properties on the Python F-Curve modifier, but that modifier has been removed in the preceeding commit. Even though `BKE_fcurve_foreach_id()` exists, it is only relevant for drivers, but the F-Curves stored in an Action are always just animation data, not drivers. No functional changes intended. Pull Request: https://projects.blender.org/blender/blender/pulls/123906