[2D][Sprite Editor] Sprite Editor slicing undo doesn't work after Apply has been pressed

Repro Steps:
- Open "Unity Bug Test (sprite slicing undo)" project
- Select the "button_square" sprite asset in the project (there's only one)
- Open the Sprite Editor for it
- Change the "border" parameters or drag the handles to change them inside the Sprite Editor
- Press Undo (notice that it works correctly)
- Change the parameters again
- Press Apply
- Notice that undo doesn't undo whatever was last done in the Sprite Editor, but whatever was done in the main editor before that (undo information was forgotten)