Stopwatch: Wait for the Spice to load before displaying things.

This makes sure the divs display at the right time so the layout doesn't break. It's very similar to the one in timer.js
stopwatch.css: Missed semicolon in the CSS declaration.
Merge pull request #997 from duckduckgo/jag/stopwatch-fix

Stopwatch: Wait for the Spice to load before displaying things.