Increase Z-Wave fallback thermostat range to 0-50 C

[MindFreeze]

Proposed change

Related to home-assistant/architecture#1152
The current 7-35 C is reported to be too restricted for some users so we increase it to 0-50 for now

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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @home-assistant/z-wave, mind taking a look at this pull request as it has been labeled with an integration (zwave_js) you are listed as a code owner for? Thanks!

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[MartinHjelmare]

Please update the failing test.

[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[AlCalzone]

Let me double check if we can handle the certification requirements with this change.

Edit: We currently can.

That's not a guarantee that it will stay that way though, since they might add a new test that we're able to set a freezer's thermostat without known limits to -18° or whatever.

[MartinHjelmare]

Maybe make it -50 to support freezers?

[AlCalzone]

I was just speaking hypothetically. Not sure if that will ever be an issue, and if it is, we could fix it then. Because right now, 0° seems more reasonable for those users with V1 thermostats.

[MartinHjelmare]

Ok.

[MartinHjelmare]

Thanks!