Remove temporary workaround in end-to-end test for iotedge check

[damonbarry]

There was a period of a few weeks between when we updated the version in the code to 1.5.0 and when we actually shipped 1.5.0. During that window of time, one of the end-to-end tests would have failed so we added a workaround. Now that we've shipped 1.5.0, this change removes the workaround.

I ran the end-to-end tests and verified that the IotEdgeCheck test passes.

Azure IoT Edge PR checklist:

This checklist is used to make sure that common guidelines for a pull request are followed.

General Guidelines and Best Practices

• [X] I have read the contribution guidelines.
• [X] Title of the pull request is clear and informative.
• [X] Description of the pull request includes a concise summary of the enhancement or bug fix.

Testing Guidelines

• [X] Pull request includes test coverage for the included changes.
• Description of the pull request includes
  • [X] concise summary of tests added/modified
  • [X] local testing done.