theme_filefield_icon incorrectly referenced.

Sorry for the lack of diff but I just found that the $imagepath was referencing relative to the node.

updated line 477 as follows:

$imagepath = base_path().drupal_get_path('module','filefield') .'/ico/'. $ext .'.png';

catting the basepath() to the top of the string.

Though getting this out of the monules directory might be a good idea, but that's another issue all togather.