Fix review dialog js-tests.

I had fixed up some of the relevant tests during my overhaul of the review
dialog, but apparently the last time I ran them was before I removed
_bodyTopEditor and _bodyBottomEditor. This change fixes those tests to use the
new _bodyTopView and _bodyBottomView, and does a little bit of extra cleanup
while I was in there.

Testing done:
Ran js-tests. After this change there are still some failures, but all of the
review dialog tests now pass.

Reviewed at https://reviews.reviewboard.org/r/6308/