revert to more graceful template structure check (#12699)

lib/browser/api/menu.js

@@ -154,7 +154,7 @@ Menu.setApplicationMenu = function (menu) {
 }
 
 Menu.buildFromTemplate = function (template) {
-  if (!(template instanceof Array)) {
+  if (!Array.isArray(template)) {
     throw new TypeError('Invalid template for Menu')
   }