Remove icon()

[fabaff]

Description:

It's a binary sensor and not a sensor.

Supersede #24171

Example entry for configuration.yaml (if applicable):

binary_sensor:
  - platform: meteoalarm
    country: 'NL'
    province: 'Groningen'

Checklist:

• The code change is tested and works locally.
• Local tests pass with tox. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]

[ghost]

Hey there @rolfberkenbosch, mind taking a look at this pull request as its been labeled with a integration (meteoalarm) you are listed as a codeowner for? Thanks!

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