ripper/tools/generate.rb: shorten generated source

* ext/ripper/tools/generate.rb (generate_eventids1): shorten
  generated source.

* ext/ripper/tools/generate.rb (generate_eventids2): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48155 b2dd03c8-39d4-4d8f-98ff-823fe69b080e