Remove unnecessary return statements

These statements were automatically added by CoffeeScript.

I'm only removing the obvious cases; there might be more cases where the
`return` statement isn't necessary.

app/assets/javascripts/watch_form_changes.js

@@ -1,4 +1,3 @@
-// Generated by CoffeeScript 1.12.6
 (function() {
   "use strict";
   App.WatchFormChanges = {
@@ -25,8 +24,8 @@
         return;
       }
       $(document).off("page:before-change").on("page:before-change", App.WatchFormChanges.checkChanges);
-      return App.WatchFormChanges.forms().each(function() {
-        return $(this).data("watchChanges", $(this).serialize());
+      App.WatchFormChanges.forms().each(function() {
+        $(this).data("watchChanges", $(this).serialize());
       });
     }
   };