UI: Fix alien containment state (another variant)

First variant here: https://github.com/SupSuper/OpenXcom/pull/714
In my opinion, first variant is better.

BaseScape:
![screen064](https://f.cloud.github.com/assets/3616568/1449509/9b76d626-426a-11e3-8a1a-454a5c53df5a.png)

BattleScape:
![screen063](https://f.cloud.github.com/assets/3616568/1449516/a614e0aa-426a-11e3-8446-80a0e5aa790b.png)