DirBrowser: Stop restoring last part of path when changing directory
DirBrowser: Stop restoring last part of path when changing directory

This code got carried over from the FileBrowser, where it did make sense
to restore the last part (the file name) when changing directory.

Fixes https://github.com/newsboat/newsboat/issues/1418

newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,der-lyse/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat,newsboat/newsboat,der-lyse/newsboat