Pin icon = Polygon icon in new layers' title box

@jayvarner @ewilloughby 

I don't think this is a big deal, just odd: 

![screen shot 2018-02-20 at 10 26 49 am](https://user-images.githubusercontent.com/29981780/36432775-08193580-1629-11e8-9c4d-deab58f019d9.png)

