1304 minor:Add/Rescan playlists progress message ...[6912]

[chrisjj]

...count stuck

When Add/Rescan adds .m3u playlists, it's status bar progress message fails to advance for tracks, meaning it can remain stuck for a long time until the operation completes.

Persists on 1304.
Was in 1164.

EDIT(TC): Tracked at http://www.ventismedia.com/mantis/view.php?id=6912