Change darksky icon for clear night

[Mariusthvdb]

change mdi:weather-sunny to mdi:weather-night for condition clear night

Breaking Change:

Description:

Related issue (if applicable): fixes #

Pull request with documentation for home-assistant.io (if applicable): home-assistant/home-assistant.io#<home-assistant.io PR number goes here>

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[homeassistant]

Hi @Mariusthvdb,

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Thanks!

[Mariusthvdb]

seems silly awkward to show a bright shining sun during the night..