Improve parts of CentCom's appearance slightly (#33832)
Improve parts of CentCom's appearance slightly (#33832)

- Fixed missing icon_states on indestructible windows, so they appear
  properly in the editor.
- Increased the symmetry of the Syndicate Infiltrator's areas.
- Pointed a few more computers in the correct direction.
- Removed unused keys so future changes will go more smoothly.
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