Typo in tests path

[the1mattkaufman]

On page:
3. Download the codelab starter app

Step
4. In the project panel on the left, delete the testing file ../tests/widget_test.dart

The path is listed as "/tests/" but in the package itself, it is actually "/test/"

[willlarche]

Thank you! I think that has varied by Flutter version. Corrected!

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