* test/ruby/test_array.rb: Ensure flatten! is used for test_flatten
  Patch by @ksss [Fixes GH-530] https://github.com/ruby/ruby/pull/530


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44928 b2dd03c8-39d4-4d8f-98ff-823fe69b080e