Fixed selection of directories with a trailing slash used with --select

Fixed selection of directories with a trailing slash used with --select
parameter.

As QHash would not match a KUrl key with it's value if the key had a
trailing slash, so it would return -1, hence the file won't get
selected.
Changed the UpdateViewState slot to remove the trailing slash before
calling the index function for the selected URL. Also modified
DolphinView to use KUrl list instead of KFileItemList to maintain
simplicity.