Update index.esm.js

[anguillanneuf]

Not sure why this import was not cleaned up.

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Error:   Failed to scan for dependencies from entries:
  /Users/tianzi/github/codelab-dataconnect-web/app/index.html

  ✘ [ERROR] Expected identifier but found ","

    src/lib/dataconnect-sdk/esm/index.esm.js:1:9:
      1 │ import { , validateArgs } from 'firebase/data-connect';