views_bonus_panels_threecol_term uses outdated api function _taxonomy_depth()

_taxonomy_depth() used in views_bonus_panels_threecol_term.module is not present in Drupal 5, leading to undefined function errors, function is only used to draw the '--' depth indicator and can be replaced with str_repeat()

diff -r1.2.2.4 views_bonus_panels_threecol_term.module
22c22
<       $prefix = _taxonomy_depth($term->depth-1). '&nbsp;';
---
>       $prefix = str_repeat('--', $term->depth-1). '&nbsp;';