Add right padding to Variant Detail table to match left padding.

[melissacline]

From @melissacline on July 29, 2016 18:32

If you select a specific variant on mobile, you'll notice there's a visible 15px padding on the left side of the div containing the variant detail table. If you swipe all the way to the right side of the table, there's no padding visible between the right side of the table and the right side of the page. In this way, it's not obvious that you're seeing the entire table (the rightmost border is not visible).

Copied from original issue: BRCAChallenge/brca-exchange#33