resourceloader: Don't cache minification of user.tokens

resourceloader: Don't cache minification of user.tokens

As of b1e4006b4, the tokens are different on every request.
Caching these is completely useless because the cache entry is
simply unreachable and is extra overhead on every request for
logged-in users to save content to Memcached.

Whether they should be minified at all and whether they perhaps
shouldn't change on every request is a separate matter.

Bug: T84960
Change-Id: I6016e4b01e44e0acbfd6d49f7d99555e2290c9cb