don't have translucent background on image post thumbnail click

[vijaykramesh]

right now there's this backColorTranslucent applied when you click on the image link preview for a post:

this looks kind of funky as the preview is then centered over the original post and you get doubling of the image with the translucent on in the background, until you click and then it black out the background.

this proposed change would just always have the blacked out background and not do the translucent thing until you click: