test-bot: stop using --recursive for `brew uses`
test-bot: stop using --recursive for `brew uses`

We're not sure this is working as it was intended to, and the primary
end product so far has been making every Ruby 1.8.7 build, which is the Ruby
we use on Mavericks for compatibility, take 5-15 minutes longer per build
than 2.x Rubies.

Cumulatively this is responsible for the vast majority of CI slowness over the
last couple months as Mavericks plays catch-up and everything else waits for it
to do so.

We may revisit this in future, but for now the harm is greater than the "risk".

This technically reverts https://github.com/Homebrew/brew/commit/7b26c585c2a26ec0dad201852ca4934c77fcc493.

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