Removed lingering comment from test.html and added destructuring for Simulator imports

Summary: Accidentally left a lingering item in test.html when I landed this widget. While I was at it,
I also took Alpert's advice and cleaned up the Graphie movable imports via destructuring.

Test Plan:
- Run Perseus.
- Try out the main Simulator test item (see old test.html in this diff).
- Verify that everything still works!

Auditors: jack