[auth_config][HTTP] API key not being added to URL

[ghost]

This issue is related to #21. As a test I've edited the source files to always show the api_key-field which worked fine and the API key was added according to the console, but when pressing on a Try it out-button the request would still fail as the API key is not passed to the final URL.

It is however displayed in the cURL section, which is very strange. I couldn't find out where exactly the request is done, so I can't create a PR.