Updated the styles for the new PR status styles

This avoids having the icon going over the left border in the new github styles

I'm wrapping it in a div with the padding rather than adding it on the returned div itself, because the returned div can be reloaded automatically by github for status changes as far as I understand the meaning of their markup (I'm not sure if that works properly when we inject the markup though as it may require some initialization depending on how the github JS code is written)