Undo when modifying a single channel causes Entire Actor track to be selected

Undo when modifying a single channel causes Entire Actor track to be selected.

This is problematic when you're trying to modify just the X, Y, or Z channel in the Graph Editor.

1. Add a sequence to a blank project
2. Create a camera
3. Create a Transform key
4. Enable the Graph Editor
5. Expand the transform track, then the translate track
6. Select the X track
7. Move the key in the graph editor
8. Ctrl+Z

Result: Camera actor track is selected and all other channel keys appear
Expected: X track stays selected and the key returns to the last location