Invalidate path hash on remove so the infoscanner can pick it up again

This fixes an issue reported on the forums where a removed movie item is not picked up by the update library routine because you can't query a previously removed fileId :)

Fix for episodes and tvshows has to be done separately as it's a lot more complicated and I don't want to add yet another regression to the upcoming Helix betas at this point.

Bug report @ http://forum.kodi.tv/showthread.php?tid=207452
Regression introduced with a32dcc1933e8568fb6107e634b9e933f96d72864 and some other refactoring (movie vs movieview)

@Montellese, @topfs2 for review please.