Remove code to fixup authenticity tokens on page load

We don't cache anything with forms in now, so the code is no longer
needed and the comment was now misleading as extra code has been added
to the ready callback.

app/assets/javascripts/application.js

@@ -121,15 +121,7 @@ function minimiseMap() {
   $("#content").removeClass("maximised");
 }
 
-/*
- * Forms which have been cached by rails may have the wrong
- * authenticity token, so patch up any forms with the correct
- * token taken from the page header.
- */
 $(document).ready(function () {
-  var auth_token = $("meta[name=csrf-token]").attr("content");
-  $("form input[name=authenticity_token]").val(auth_token);
-
   $("#menu-icon").on("click", function(e) {
     e.preventDefault();
     $("header").toggleClass("closed");