fix(npm): remove export binding to match node

[dsherret]

Closes #15790

[dsherret]

Example in Node:

> cat other.cjs
module.exports = {
  test() {
    return this.other();
  },
  other() {
    return 5;
  }
};

> cat file.mjs
import defaultImport from "./other.cjs";
import * as namespaceImport from "./other.cjs";
import { test } from "./other.cjs";

console.log(defaultImport.test());
console.log(test());
console.log(namespaceImport.test()); // this also throws in Node, but actually not currently in this PR in Deno...

> node file.mjs
5
V:\scratch-npm\other.cjs:3
    return this.other();
                ^

TypeError: this.other is not a function
    at Module.test (V:\scratch-npm\other.cjs:3:17)
    at file:https:///V:/scratch-npm/file.mjs:6:12
    at ModuleJob.run (node:internal/modules/esm/module_job:198:25)
    at async Promise.all (index 0)
    at async ESMLoader.import (node:internal/modules/esm/loader:385:24)
    at async loadESM (node:internal/process/esm_loader:88:5)
    at async handleMainPromise (node:internal/modules/run_main:61:12)

[littledivy]

LGTM