Tweak Dremel 3D Printer sensors

[tkdrob]

Proposed change

No breaking change as the integration is only in dev.

Time deltas were using the wrong operator (showed a time in the past for something that should be in the future).
Renamed remaining time to completion time. This seems to make more sense as the UI displays it as for example (in 30 minutes).
Adjusted elapsed time unit of measurement and device class. This will now show for example (30 min) which seems more natural.
Same as above was done with Estimated total time which is not a point in time but a duration.
Hours used looked weird to me displaying as 36:00:00 which only displays hours and never minutes or seconds. So this will now show as 36 hr.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
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[frenck]

Thanks, @tkdrob 👍

../Frenck

[frenck]

Oh! There is a merge conflict, can you take a look?

../Frenck

[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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[frenck]

@tkdrob Ready to go now? As in, still draft for a reason?

[frenck]

Thanks, @tkdrob 👍