Solution for: Differentiate Locked and Unlocked Backgrounds (#4261)

1. Added two new background-specific styles to `customizer.styl` (4px gray border and 4px white border) and utilized them in `profile.jade` by checking for ownership of the asset and displaying a border (or not, as appropriate). 

2. Editor automatically cleaned up some trailing spaces on a few lines of `profile.jade`
Ahh, that makes sense. You'd need an extra container to do a transparent border. 

@alys what do you think? Is it worth making the border transparent, but complicate the markup? Or leave it white for now?