Remove check for obsolete option opt_gettalkemail

opt_gettalkemail is now used to check if we've converted over to ESN.
(If we have, it's X). Eventually we'll have everyone converted over,
which means that this will never equal Y -- which means that people will
stop getting "moderated entry has been approved" messages.

So... let's avoid that
Merge pull request #621 from afuna/moderate-notification

Remove check for obsolete option opt_gettalkemail