[REVIEW] added semi-colons to prevent jsmin breaking

Created by: rosscdh

Currently when using jsmin the dropdown component causes breaks.

dropdown.js:119:121

    if (e.which == 38 && index > 0)                 index--         // up
    if (e.which == 40 && index < $items.length - 1) index++         // down
    if (!~index)                                    index = 0

notice the missing ; at the end of line

results in