refactor: small code fix for hot-reload (#1079)

Author: Jinjiang

lib/loader.js

@@ -413,7 +413,7 @@ module.exports = function (content) {
       output +=
         `    hotAPI.${
           functionalTemplate ? 'rerender' : 'reload'
-        }("${moduleId}", Component.options)\n' + '  }\n`
+        }("${moduleId}", Component.options)\n  }\n`
       // dispose
       output +=
         '  module.hot.dispose(function (data) {\n' +