Meta-boxes don't behave as normal on edit comment page

[bbrooks]

The following was noted on trunk rev.21,458

On the edit comment page, meta boxes added by plugins (like Akismet) are not collapsible or rearrange-able.

Also, unchecking meta boxes in the 'screen options' in this context does not hide them as expected

To reproduce:

1. Add an arbitrary meta-box to the edit comments page (Fastest way is just to enable Akismet)
2. Make a comment
3. Go to the comment editor for that comment
4. Below the main text area, try to close or move the meta-box you added in step 1

Best guess is that whatever JS is required for metabox behavior is not loaded on the edit comment page.