add mage/adminhtml/tools for Base64

Author: Nazar65

app/code/Magento/Variable/view/adminhtml/web/variables.js

@@ -16,7 +16,8 @@ define([
     'Magento_Variable/js/custom-directive-generator',
     'Magento_Ui/js/lib/spinner',
     'jquery/ui',
-    'prototype'
+    'prototype',
+    'mage/adminhtml/tools'
 ], function (jQuery, notification, $t, wysiwyg, registry, mageApply, utils, configGenerator, customGenerator, loader) {
     'use strict';
 

lib/web/mage/adminhtml/wysiwyg/tiny_mce/plugins/magentovariable/editor_plugin.js

@@ -9,7 +9,8 @@ define([
     'Magento_Variable/js/config-directive-generator',
     'Magento_Variable/js/custom-directive-generator',
     'wysiwygAdapter',
-    'jquery'
+    'jquery',
+    'mage/adminhtml/tools'
 ], function (configDirectiveGenerator, customDirectiveGenerator, wysiwyg, jQuery) {
     return function (config) {
         tinymce.create('tinymce.plugins.magentovariable', {