bbPress.org

I want want to remove the permission that moderators can delete topics and posts from the trash. But how can I change the standard permissions from bbPress?

I made this code but it doesn’t work because bbPress roles are separated from WordPress roles:

function changePermissions() {
	$role = get_role('moderater');
	$role->remove_cap('delete_others_topics');
	$role->remove_cap('delete_others_replies');
}
add_action('init', 'changePermissions');