Fix Shelly gen2 channel name

[thecode]

Proposed change

While writing tests at #82642, I found a small bug in creating channel name for older Gen2 devices, this mainly affects older firmware which doesn't contain the name key.

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.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• The code has been formatted using Black (black --fast homeassistant tests)
• Tests have been added to verify that the new code works.

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• Documentation added/updated for www.home-assistant.io

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• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
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• I have reviewed two other open pull requests in this repository.

[home-assistant]

Hey there @balloob, @bieniu, @chemelli74, @bdraco, mind taking a look at this pull request as it has been labeled with an integration (shelly) you are listed as a code owner for? Thanks!

Code owner commands

Code owners of shelly can trigger bot actions by commenting:

• @home-assistant close Closes the issue.
• @home-assistant rename Awesome new title Change the title of the issue.
• @home-assistant reopen Reopen the issue.
• @home-assistant unassign shelly Removes the current integration label and assignees on the issue, add the integration domain after the command.

[thecode]

@bdraco let's continue the discussion from #82642 (comment) here

[thecode]

Thanks

[thecode]

codecov failure is not related.

Name                                                    Stmts   Miss  Cover   Missing
-------------------------------------------------------------------------------------
homeassistant/components/shelly/__init__.py               156      0   100%
homeassistant/components/shelly/binary_sensor.py           63      0   100%
homeassistant/components/shelly/bluetooth/__init__.py      23      0   100%
homeassistant/components/shelly/bluetooth/scanner.py       23      0   100%
homeassistant/components/shelly/button.py                  47      0   100%
homeassistant/components/shelly/climate.py                175      0   100%
homeassistant/components/shelly/config_flow.py            163      0   100%
homeassistant/components/shelly/const.py                   57      0   100%
homeassistant/components/shelly/coordinator.py            324      5    98%   312, 498, 529, 538, 540
homeassistant/components/shelly/cover.py                  104      0   100%
homeassistant/components/shelly/device_trigger.py          60      0   100%
homeassistant/components/shelly/diagnostics.py             27      0   100%
homeassistant/components/shelly/entity.py                 323      0   100%
homeassistant/components/shelly/light.py                  205      0   100%
homeassistant/components/shelly/logbook.py                 29      0   100%
homeassistant/components/shelly/number.py                  45      0   100%
homeassistant/components/shelly/sensor.py                  82      0   100%
homeassistant/components/shelly/switch.py                  76      0   100%
homeassistant/components/shelly/update.py                 122      0   100%
homeassistant/components/shelly/utils.py                  204      1    99%   240
-------------------------------------------------------------------------------------
TOTAL                                                    2308      6    99%