remove reveal marked, markdown plugin comment.

src/client/js/legacy/crowi-presentation.js

@@ -33,8 +33,6 @@ Reveal.initialize({
 
 require.ensure([], () => {
   require('reveal.js/lib/js/classList.js');
-  // require('reveal.js/plugin/markdown/marked.js');
-  // require('reveal.js/plugin/markdown/markdown.js');
   require('reveal.js/plugin/zoom-js/zoom.js');
   require('reveal.js/plugin/notes/notes.js');
   require('../util/reveal/plugins/growi-renderer.js');