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/sortable.js

@@ -1,4 +1,3 @@
-// Generated by CoffeeScript 1.12.6
 (function() {
   "use strict";
   App.Sortable = {
@@ -9,7 +8,7 @@
           new_order = $(this).sortable("toArray", {
             attribute: "data-answer-id"
           });
-          return $.ajax({
+          $.ajax({
             url: $(".sortable").data("js-url"),
             data: {
               ordered_list: new_order
@@ -18,13 +17,13 @@
           });
         }
       });
-      return $(".sortable-priotirized-votation").sortable({
+      $(".sortable-priotirized-votation").sortable({
         update: function() {
           var new_order;
           new_order = $(this).sortable("toArray", {
             attribute: "data-answer-id"
           });
-          return $.ajax({
+          $.ajax({
             url: $(this).data("js-url"),
             data: {
               ordered_list: new_order