Bug 858291 Flicks promo looks broken at lower resolutions

The Firefox flicks promo thumb on the home page was being incorrectly positioned when changing viewport breakpoints. 

To reproduce, re-size the browser when the flicks tab is not visible, then switch to it after re-size. The bug was occurs due to jQuery reporting a width of `0` for an element when it is hidden, resulting in an incorrect left offset.

But since the positioning for the thumbnail is already defined in CSS for all viewport sizes, the easiest fix is to remove code, instead of add more?