$.context deprecated

# `$.context` deprecated as of jQuery v.1.10, removed as of jQuery v.3.0

This was the only use of the `$.context` so I changed it to `$.get(0).`
which should continue to work in future versions of jQuery.

Author: FuzzyBS

src/modules/security.js

@@ -557,7 +557,7 @@
 		grecaptchaRenderCallback = [];
     $forms.each(function () {
       var $form = $(this),
-        config = $form.context.validationConfig || false;
+        config = $form.get(0).validationConfig || false;
       if (config) {
 
       $('[data-validation~="recaptcha"]', $form).each(function () {