Fix __webpack_public_path__ for 1.11 (#11907)

Fixes: #11839

Author: silverwind

web_src/js/publicPath.js

@@ -3,7 +3,7 @@
 const { StaticUrlPrefix } = window.config;
 
 if (StaticUrlPrefix) {
-  __webpack_public_path__ = StaticUrlPrefix.endsWith('/') ? StaticUrlPrefix : `${StaticUrlPrefix}/`;
+  __webpack_public_path__ = `${StaticUrlPrefix.endsWith('/') ? StaticUrlPrefix : `${StaticUrlPrefix}/`}js`;
 } else if (document.currentScript && document.currentScript.src) {
   const url = new URL(document.currentScript.src);
   __webpack_public_path__ = `${url.pathname.replace(/\/[^/]*$/, '')}/`;