test-bot: always check style of formula.

Library/Homebrew/dev-cmd/test-bot.rb

@@ -634,6 +634,7 @@ module Homebrew
           install_passed = steps.last.passed?
         end
       end
+      test "brew", "style", formula_name
       test "brew", "audit", *audit_args
       if install_passed
         if formula.stable? && !ARGV.include?("--fast") && !ARGV.include?("--no-bottle") && !formula.bottle_disabled?