Fix syntax

lib/browser/api/menu-item.js

@@ -11,8 +11,9 @@ const MenuItem = function (options) {
   for (let key in options) {
     if (!(key in this)) this[key] = options[key]
   }
-  if (typeof this.role === 'string' || this.role instanceof String)
+  if (typeof this.role === 'string' || this.role instanceof String) {
     this.role = this.role.toLowerCase()
+  }
   this.submenu = this.submenu || roles.getDefaultSubmenu(this.role)
   if (this.submenu != null && this.submenu.constructor !== Menu) {
     this.submenu = Menu.buildFromTemplate(this.submenu)