Disable all editor buttons instead of the last one

Author: vovayatsyuk

app/code/Magento/Ui/view/base/web/js/form/element/wysiwyg.js

@@ -45,7 +45,8 @@ define([
                 component: this,
                 selector: 'button'
             }, function (element) {
-                this.$wysiwygEditorButton = $(element);
+                this.$wysiwygEditorButton = this.$wysiwygEditorButton ?
+                    this.$wysiwygEditorButton.add($(element)) : $(element);
             }.bind(this));
 
             return this;