We were using the raw siteconfig.settings.get() call to figure out

whether we want to use Gravatars. This wasn't able to fall back to the

default, since that's just a simple dictionary function. By using

siteconfig.get() instead, we're able to fall back to the default,

showing Gravatars on installs where the checkbox hasn't been toggled off

and back on.
This also fixes a parameter order issue when building the review reply

list. The Gravatar argument was in the wrong location, resulting it it

always being on. This had a worse side-effect of the comment ID not

being set. This meant if a user had a draft reply and reloaded the page,

they would not be able to update, publish, or delete the comment.

Verified that Gravatars were working in all locations.
Verified that I could save/delete draft replies again after a page reload.