[Classic] Button to remove changes does not work

[Crossbow78]

Only affects classic clients, not retail. Introduced in 11.0.5-2.

The missing mouseover highlight already gives away that the script is not bound to the button.

It seems that there is a difference how the (LibQTip?) tooltip columns deal with the rightmost column:

• On retail, adding the rightmost cell returns the column index for the next (non-existing) column.
• On classic, adding the rightmost cell returns 0 for the column index.