UniFi - reverse connectivity logic

[Kane610]

Breaking Change:

Description:

@arsaboo pointed out inconsistencies with other definitions of connectivity in HASS. So I'm reversing the logic. This also puts it inline with how the POE switch represents on/off state in component.

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>

Example entry for configuration.yaml (if applicable):

Checklist:

• The code change is tested and works locally.
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