Fix action KalibroModule#module_results

[diegoamc]

Before, our business logic was that one KalibroModule could be related to many ModuleResults.
That logic has changed. Now, a KalibroModule only relates to one ModuleResult.

But our KalibroModule controller still reflects the old logic, as can be seen here.

We should adapt that action to the new logic.
After that we need to update our kalibro clients.

[diegoamc]

This PR is related but does not solve the problem. It only prevents errors that can occur today, not breaking the API.

To actually fix this, we need to update the controller. That will break the KalibroProcessor's API. We've considered the change too small for a major release, so we will wait for when there are more significant changes accumulated.

In fact, maybe this is not an issue after all since our kalibro clients do not implement a request for the KalibroModule#module_results action. So, do you think we need to keep it? Or can we just remove it?

The only argument I have for keeping it is that other kalibro clients may need it.