fix(beca_bht002_thermostat_c): allow setting up to 45 degrees
The app has an advanced settings menu which allow adustment of min and max
temperature. 5 - 35 is the default range, but the full range is 5 - 45, as
min temperature is adjustable to 5 - 15, and max 15 - 45.
Unfortunately the device does not seem to broadcast the current min and max
settings locally, so they cannot be directly used, but allowing the full
range lets users take full advantage of the device, which should then
clamp the range itself since it isn't broadcasting it for us to clamp for it.
Issue #6257
Jason Rumney