After migrating from `fontgen-loader` icons seem to be created with extra width
I'm attempting to upgrade from your old library `fontgen-loader` to `webfonts-loader` (as well as from webpack v2 to v4).

It appears that icons which were working correctly in `fontgen-loader` are created with "extra width" in `webfonts-loader`. This extra width appears as empty space on the right. You can see what I mean in the screenshots below. The icon's extra width is causing the circle which contains it to be misshapen. 

<img width="33" alt="Screen Shot 2019-11-29 at 7 46 21 PM" src="https://user-images.githubusercontent.com/24050/69896257-53238600-12e1-11ea-81b7-67c0ab1ee840.png">

<img width="44" alt="Screen Shot 2019-11-29 at 7 46 10 PM" src="https://user-images.githubusercontent.com/24050/69896256-51f25900-12e1-11ea-8a5a-4c186356d82a.png">

It appears exactly as if the icon has a `margin-right` or `padding-right` applied to it, but I am absolutely 100% certain this is not the case. The icon element itself appears to be missized. (Note that the extra width doesn't seem to double the size of the icon, more like add 50%).

I'm not super adept at working with fonts so I'm not really sure how to go about verifying that the "bad" sizing is actually embedded into the webfont file (which is what I'm assuming), so if someone could help me check on that, it would be appreciated.