Fix/290 set flow temperature optimization mytado

[xiic]

• See [Bug]: set_flow_temperature_optimization does not return data (any more?) #290
• Also added roomLinkAvailable to rooms_and_devices.json fixture

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@8145631). Learn more about missing BASE report.
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #291   +/-   ##
=========================================
  Coverage          ?   76.22%           
=========================================
  Files             ?       37           
  Lines             ?     2191           
  Branches          ?      129           
=========================================
  Hits              ?     1670           
  Misses            ?      484           
  Partials          ?       37           

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