Playlist Viewer: Fix dir not updated after playlist removal
Missed this in 6a865f2430
If you entered the Playlist Viewer using the
context menu option "View", instead of from
the Playlist Catalogue, a playlist file that was
deleted due to the removal of all of its tracks
would still be displayed in the directory when
returning
Change-Id: I54ca34f70344e289d9e2cb413ee2a38e5bd7a92b