Made 2-of-same-item apply to OVERSIZE items as well.

![An absurd example](http://s13.postimg.org/cevnvel9z/oversized.png)

Nothing else was changed, so OVERSIZE still ignores every check other than it being wearable in the first place and not mixing normal and power armor.

In some cases that still leads to silliness (you can still wear two XL survivor helmets over your heavy survivor helmet, for instance), but the tripling-up check seemed like an uncontroversial thing to pull.

It's oversized, sure, but it's not THAT oversized.