Some clients send the SYNC_FOLDERTYPE data in EAS > 12.1 here.

When sending SYNC_ADD commands, *some* clients will send the SYNC_FOLDERTYPE
node here when EAS > 12.1 while others will not. So far, Outlook is the
only client I have seen that does this, so we need to be able to accept it
if it's sent.

Fixes being unable to add new items from Outlook.
Grab the SYNC_FOLDERTYPE, if needed, when adding the collection.

Do it here, instead of while parsing the collections since we
might have obtained the folder type from multiple incoming
requests.
This could be useful to know, log it.
BFN