KlipperPopup: Always start from beginning of the list
Currently we set the listView currentIndex to 0 when the view is hidden. This causes the index to be wrong when the view is opened again, if anything was copied when the view was hidden.
Instead just always set the currentIndex to 0, to make sure the first item is always selected.
BUG: 505493 FIXED-IN: 6.4.1