module: ensure exact file url passed to top-level import for main

Fixes: #15374

Author: guybedford

lib/module.js

@@ -435,7 +435,7 @@ Module._load = function(request, parent, isMain) {
     if (experimentalModules) {
       if (filename === null || /\.mjs$/.test(filename)) {
         try {
-          ESMLoader.import(request).catch((e) => {
+          ESMLoader.import(getURLFromFilePath(filename).href).catch((e) => {
             console.error(e);
             process.exit(1);
           });