taxonomy arg being passed inconsistently

taxonomy_del_term is passing it's third arg as an object when it invokes hook taxonomy--this makes the delete case of hook_taxonomy inconsistent, which is reflected in forum_taxonomy--it won't work properly ATM. attached patch replaces the recently removed array cast in taxonomy_del_term, changes forum_taxonomy to use an array instead of an object, and removes a bit of extra whitespace. casting to an array makes the most sense here since all other cases of hook_taxonomy have their third arg as an array...