fix issue when fixedWidth && normalize both true

When fixedWidth set true , no need to scale the glyph width during normalize.
otherwise, we will get the icons like bellow, the origin size is smaller, and it wil be more width:

![image2993](https://cloud.githubusercontent.com/assets/1667873/3383851/f399cb10-fc50-11e3-9858-0e842397f7aa.png)


thx. again