pass the $type_of_url context param on user_trailingslashit() for CPT's

[dd32]

Currently get_post_permalink() does not pass the context flag to user_trailingslashit(), this means that for custom post types, it's not possible to target them through the 'user_trailingslashit' filter.

It might be worth checking to see if taxonomies and any other uses of user_trailingslashit() pass the context as well.

redirect_canonical() also passes url's through this filter, In the case of *all* single pages(including that of CPT's), the context is set to 'single'.