2 Undead horrors you probably thought were gone for good

Summary:
Re-enable the answer area in test.html. While it's live, it
can have bugs, and we should have easy access to testing it,
and reminders to test it. Basically, let's not forget about
it even though we're asking content creators to.

Test Plan:
 * Load `test.html`.
 * See old answer area editor
 * comment out `enableOldAnswerTypes` in test.html
 * see new answer area editor

Auditors: alex