Describe the bug

The new Padding controls should remove user changes when "Reset" is clicked. At the moment, it only removes session based changes.

This issue was originally discussed here:
#21492 (comment)

To reproduce

• sets a value for padding to 20
• saves the post
• reloads the editor
• click reset
• at this point, the padding value is 20 but reset doesn't work (I expected I'd be able to reset them)

Expected behavior

• sets a value for padding to 20
• saves the post
• reloads the editor
• click reset
• Padding should be 0. No padding inline styles