MacOS: fixes an issue with the recents item that doesn't list the opened media...

MacOS: fixes an issue with the recents item that doesn't list the opened media since changes made in b0620aea.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit c6b77506dde6f72b217bfb890cc7800fc1e68d9d)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/macosx/playlist.m

@@ -1161,7 +1161,7 @@
     }
 
     /* Recent documents menu */
-    o_true_file = [NSURL fileURLWithPath: o_uri];
+    o_true_file = [NSURL URLWithString: o_uri];
     if( o_true_file != nil && (BOOL)config_GetInt( p_playlist, "macosx-recentitems" ) == YES )
     {
         [[NSDocumentController sharedDocumentController]