Revert "disable resize code (#1558)"

This reverts commit c50dc53042.

app/assets/javascripts/notes.js

@@ -203,7 +203,6 @@ Danbooru.Note = {
     },
 
     resize: function($note_body) {
-      return;
       var w = $note_body.width();
       var h = $note_body.height();
       var golden_ratio = 1.6180339887;