Fix redirect in "disable responsive mode" link.

app/assets/javascripts/common.js

@@ -29,13 +29,14 @@ $(function() {
     e.preventDefault();
   });
 
-  $("#desktop-version-link a").click(function() {
-    $.ajax("/users/" + Danbooru.meta("current-user-id"), {
+  $("#desktop-version-link a").click(function(e) {
+    e.preventDefault();
+    $.ajax("/users/" + Danbooru.meta("current-user-id") + ".json", {
       method: "PUT",
       data: {
         "user[disable_responsive_mode]": "true"
       }
-    }).success(function() {
+    }).then(function() {
       location.reload();
     });
   });

app/controllers/users_controller.rb

@@ -68,7 +68,9 @@ class UsersController < ApplicationController
     else
       flash[:notice] = "Settings updated"
     end
-    respond_with(@user, location: edit_user_path(@user))
+    respond_with(@user) do |format|
+      format.html { redirect_back fallback_location: edit_user_path(@user) }
+    end
   end
 
   private