1261 Location Paste can leave wrong track properties [#6054]

[chrisjj]

1 In tree, click a location sub-node
2 On tracklist, select a track and Copy
3 In tree, click a location sub-node containing a track with same filename and different properties
4 Click Paste
5 In conformation dialog box, click Yes

Expected: tracklist shows properties of pasted file
Observed: tracklist shows properties of replaced file!

Tracked at http://www.ventismedia.com/mantis/view.php?id=6054