[2.4.8-beta2] Downgrade TinyMCE dependency from version 7 to version 6.8.5

Author: jayrangnani-gl

lib/web/mage/adminhtml/wysiwyg/tiny_mce/tinymceAdapter.js

@@ -672,7 +672,7 @@ define([
             return content.gsub(/<([a-z0-9\-\_]+[^>]+?)([a-z0-9\-\_]+="[^"]*?\{\{.+?\}\}.*?".*?)>/i, function (match) {
                 var attributesString = match[2],
                     decodedDirectiveString;
-                
+
                 // process tag attributes string
                 // eslint-disable-next-line no-useless-escape
                 attributesString = attributesString.gsub(/([a-z0-9\-\_]+)="(.*?)(\{\{.+?\}\})(.*?)"/i, function (m) {