Currently the tests casks found in "/Homebrew/test/support/fixtures/cask/Casks" and "/Homebrew/test/support/fixtures/third-party/Casks" aren't included in the paths checked when running "brew cask style".
This change includes these test cask paths in the checked paths, and also includes the auto style fixes made by running `brew cask style --fix`.
This provides a more consistent version for `rubocop` than relying on
`Homebrew.install_gem_setup_path!` (and we really want `brew style` to
provide consistent output).
