test_require.rb: fix expected path
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59012 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_require.rb: fix expected path
slash. the result of File.expand_path has a slash just follows
the drive letter.
https://github.com/ruby/ruby/commit/4ef849bd9014746821402e21053a53ea61b3690d#commitcomment-22391133
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@59012 b2dd03c8-39d4-4d8f-98ff-823fe69b080e