Vox sign/N2 locker update (#31845)

Vox sign/N2 locker update (#31845)

* Vox sign/N2 locker update

The "vox area" sign and N2 locker sprite were both taken from /vg/station. These sprites have bad racist connotations as discussed in https://github.com/space-wizards/space-station-14/issues/31840, and do not fit our server culture.

The new N2 locker is not a taped on piece of trash. It now also has a blue stripe to mimic the regular O2 locker and make it more distinct from fire safety closets.

The new "vox area" sign sprite follows the same style as other "area indicator" signs used throughout the blue and isn't an explicit warning sign anymore. It still has "No O2" on it to fill that role though.

* emogarbage adjustments

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Co-authored-by: EmoGarbage404 <retron404@gmail.com>