Remove redundant captcha logic (#1383)

themes/bootstrap3/js/lightbox.js

-/*global grecaptcha, recaptchaOnLoad, resetCaptcha, VuFind */
+/*global recaptchaOnLoad, resetCaptcha, VuFind */
 VuFind.register('lightbox', function Lightbox() {
   // State
   var _originalUrl = false;
@@ -272,13 +272,6 @@ VuFind.register('lightbox', function Lightbox() {
     // Gather data
     var form = event.target;
     var data = $(form).serializeArray();
-    // Check for recaptcha
-    if (typeof grecaptcha !== 'undefined') {
-      var recaptcha = $(form).find('.g-recaptcha');
-      if (recaptcha.length > 0) {
-        data.push({ name: 'g-recaptcha-response', value: grecaptcha.getResponse(recaptcha.data('captchaId')) });
-      }
-    }
     // Force layout
     data.push({ name: 'layout', value: 'lightbox' }); // Return in lightbox, please
     // Add submit button information