Add an hidden submit

This hidden submit makes auto submit while user press Enter on IP
input field.

resources/views/settings/audit.blade.php

@@ -52,6 +52,7 @@
                 <div class="form-group ml-auto">
                     <label for="ip">{{ trans('settings.ip_address') }}</label>
                     @include('form.text', ['name' => 'ip'])
+                    <input type="submit" style="display: none">
                 </div>
             </form>
         </div>