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test_lambda.rb: refine test

• test/ruby/test_lambda.rb (test_lambda_as_iterator): refine a
  test for the intention of the original report.
  [ruby-core:61340] [Bug #9605]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58016 b2dd03c8-39d4-4d8f-98ff-823fe69b080e