Revert "fix bad alias (fix #1239)"

This reverts commit f4f59f5.

Author: LinusBorg

template/build/webpack.base.conf.js

@@ -37,7 +37,7 @@ module.exports = {
       {{#if_eq build "standalone"}}
       'vue$': 'vue/dist/vue.esm.js',
       {{/if_eq}}
-      '@/': resolve('src'),
+      '@': resolve('src'),
     }
   },
   module: {