filter_types and filter_categories are not cached

[jace]

The filter_types and filter_categories functions have a cache decorator. However, the cache is never hit and the database gets hit each time, possibly because of the "basequery" and "board" parameters causing "memoize" to land a new lookup key on each call. This means Redis is also getting flooded with keys it will never use again.

We need to either change the parameters or change the way they are memoized for cache.