sample stateInputBinding.js for javascript-v4-azurefunction does not return state content

[KaiWalter]

After putting state for the above sample code with

curl -X POST http://localhost:7071/api/state/test1 -d '{"Name":"John Doe"}'

and trying to retrieve it with

curl -v http://localhost:7071/api/state/test1

HTTP status 204 and no content is returned.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (799f7c9) 67.01% compared to head (fd84291) 67.01%.

:exclamation: Current head fd84291 differs from pull request most recent head 1d2db8b. Consider uploading reports for the commit 1d2db8b to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #186 +/- ## ======================================= Coverage 67.01% 67.01% ======================================= Files 53 53 Lines 1052 1052 Branches 158 158 ======================================= Hits 705 705 Misses 287 287 Partials 60 60 ```

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