refactor: rm configs key in the new plugin passed to shareable config

Author: jjangga0214

src/configs/recommended.js

@@ -1,11 +1,11 @@
 const jsxA11y = require('..');
 
+const plugin = { ...jsxA11y };
+delete plugin.configs;
+
 module.exports = {
   plugins: {
-    'jsx-a11y': {
-      ...jsxA11y,
-      configs: undefined,
-    },
+    'jsx-a11y': plugin,
   },
   languageOptions: {
     parserOptions: {