JJ: vibrations: Replace Cancel/OK buttons with Close?

In 0.9.3, what's the difference between the Cancel and OK buttons for the vibrations dialog? Assuming they are doing the same, they should probably be replaced by a single "Close" button (if that is feasable in Qt).

If OK saves some settings and Cancel doesn't - I am not sure this fine-grained control is warranted here compared to possible user confusion. Just save the settings (and it seems the scale slider and whether or not to display vectors are saved anyway)