Do not autoequip two-wide ammo if not enough belt space

Trying to avoid something like this:
![screen021](https://f.cloud.github.com/assets/1824834/1567411/b247e9b2-509d-11e3-8006-8899571ce4c3.png)

There was already a clip on the right of the belt and the auto equip put another one overlapping it.