update icon: unity (original, original-wordmark, plain, plain-wordmark, line, line-wordmark) (#1994)

* fix artifacts for line versions

* resize all versions to fit viewbox

* Remove unnecessary whitespaces

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Co-authored-by: Josélio Júnior <76992016+lunatic-fox@users.noreply.github.com>

icons/unity/unity-plain.svg

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