test_lambda.rb: fix messages

* test/ruby/test_lambda.rb (test_{do,brace}_lambda_source_location):
  fix messages, missed to commit at r42980.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42981 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-09-20

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42982 b2dd03c8-39d4-4d8f-98ff-823fe69b080e