Temporarily fix Chrome 38 multiple-select bug

A temporary fix for: https://code.google.com/p/chromium/issues/detail?id=423256 (see also: http://jsfiddle.net/1z1tskwh/4/)

When an item is preselected for a `<select>` which can have multiple values, Chrome 38 scrolls down the page. This makes editing and reviewing editions difficult. This is a temporary fix that scrolls the page back to the top on Chrome versions lower than 39.

This fix should be removed when Chrome 39 has been released.