Vox Hardhats Fix (shiptest-ss13#2604)

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Adds a few missing iconstates to vox hardhats.
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As silly as it was to watch your local vox's head be consumed by The
Void whenever they wanted to see better, it wasn't very good for
immersion. Also, bugs bad, m'kay?
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:cl:
imageadd: Adds missing iconstates to vox hardhats. Taste the void no
longer!
/:cl:

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