fix: Correct format of Bearer authentication header

[stefano-pogliani]

Hi 👋

I recently noticed that around the 21st of August the exporter stopped refreshing my heating information.

I discovered the issue is around failing to authenticate.
Executing the same API calls the exporter performs in another REST client worked.
The only difference between the request is Bearer: (from the code) vs Bearer (from my REST client).

This PR removes the : after Bearer in the authentication header, which fixes the issue.
Looking at the RFC the : is not expected.

Given this broke without changes on my side I expect Tado updated their systems and new version rejects Bearer: while the old one allowed it 🤷

I hope this helps and thanks for the useful project,
Stefano

[gyulaasztalos]

Thank you for sharing this fix. Working great!

[zearthlink]

Thanks, the fix works great

[squeeb]

Confirmed working

[eko]

Thank you @stefano-pogliani