Fix uri which should be included

I ran RSpec test with ruby 2.0.0-p0 and it failed.
While Ruremai::Locator::Rurema::Ja#candidates generate URI with RUBY_VERSION, two of URIs in rurema_spec.rb contain not #{RUBY_VERSION} but "1.9.3".
So I unified the format of URIs in ruremai_spec.rb.