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`
One thing to note - I originally went with a transparent border for un-purchased (for the reasons specified - future-proofing), but due to how tightly the graphics are on the `spritesmith0.png` asset, the transparent border actually bled into the adjacent graphics and I could not utilize it because I could not work around that problem.