Fix issue with extraData field when editing offer

[ghost]

Reported by @stakoholic, when editing an offer some information was not being transferred.

extraData is used for the account age and other custom fields like F2F city.
So when editing an offer the extraData should be obtained from the edited offer not the original one.

Fixes #5597
FYI @ghubstan this one line fix also needs carrying over to the current editoffer API work.

---

Testing:

You have an Amazon gift card account which is 4 days old (for example).
Create an F2F account which specifies city as 'Paris' and additional information as "ask for Freddie".

Prior version: (bug)

• Create offer to buy 0.01 BTC using Amazon gift card.
• Edit the offer changing payment account to F2F.
• Look at the offer in the order book.
• It should show the F2F city ('Paris') but it is blank.
• It should show additional information ("ask for Freddie") but it is blank.
• It should show the account age as 0 days old but instead shows it as 4 days old.

Version with fix applied:

• Create offer to buy 0.01 BTC using Amazon gift card.
• Edit the offer changing payment account to F2F.
• Look at the offer in the order book.
• It shows the F2F city ('Paris').
• It shows additional information as "ask for Freddie".
• It shows the account age as 0 days old.

[ghubstan]

FYI @ghubstan this one line fix also needs carrying over to the current editoffer API work.

@jmacxx Thanks for the heads up. I do need to adjust the api to this change.

You seem to already know it only affects new api method editoffer, which has not been merged into master yet. And, api method editoffer v1 cannot change payment acct details -- just offer price details. But I plan to make the change this week.

[ripcurlx]

utACK