Improve calibration by requesting heat

When no heat is requested, the pressure in the system can be so low, that the radiator valve pin does not spring out fully. This can result in an E4 error, or invalid calibration.

This can be manually resolved by enabling boost heating before mounting the smart radiator thermostats. However, I suggest that the Tado software handles this automatically when it recognizes invalid calibration to ease installation and improve calibration.
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