Fix Met Office Sensor

[girlpunk]

Description:

Fixes the Met Office sensor issues raised at https://community.home-assistant.io/t/metoffice-integration/15537. No new dependencies or files.

Related issue (if applicable): fixes https://community.home-assistant.io/t/metoffice-integration/15537

Pull request in home-assistant.github.io with documentation (if applicable): N/A, no configuration changes

Checklist:

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated in home-assistant.github.io

If the code communicates with devices, web services, or third-party tools:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• New dependencies have been added to the REQUIREMENTS variable (example).
• New dependencies are only imported inside functions that use them (example).
• New dependencies have been added to requirements_all.txt by running script/gen_requirements_all.py.
• New files were added to .coveragerc.

If the code does not interact with devices:

• Local tests with tox run successfully. Your PR cannot be merged unless tests pass
• Tests have been added to verify that the new code works.

[mention-bot]

@cyberjacob, thanks for your PR! By analyzing the history of the files in this pull request, we identified @jacobtomlinson and @fabaff to be potential reviewers.

[balloob]

Thanks!

Cherry-picked for 0.46.1