Fix left-side-cutoff problem with prepended inputs in togglable tabs

Created by: jpadvo

When a prepended input is inside of a togglable tab, the left border gets cut off; see this fiddle:

http://jsfiddle.net/RyesV/

To fix it I simply (naively) added 1px of margin to the left side of prepended inputs if they are inside a .tab-content element. Seems to work.