Fix aim assist for 'long' and 'wide' liststyles

Netrw makes mouse navigation easier by not requiring that you aim
exactly at the filename. Clicking anywhere on the line (in 'thin' and
'long' styles) or in the cell (in 'wide' style) suffices.

@db8def4f63d1c5827776a2e5ca186a1bd893fcaa fixes position restoring when
clicking ../ only if you hit it exactly. If you click nearby it still
goes where it has to, but the wrong position is saved.
This is because VinegarDown() was used for going up :)