Currently, the transaction table will display an address label for self-payments only if there's one recipient (ie - if you've sent your entire balance to one address you own).
This PR changes it to show labels for any addresses that have labels in the address book. It's a follow-up to https://github.com/bitcoin/bitcoin/pull/15098.
Before:
<img width="1523" alt="image" src="https://user-images.githubusercontent.com/116917595/213289483-816c2580-d9fc-4cda-9aae-6f1b212dd020.png">
After:
<img width="1521" alt="image" src="https://user-images.githubusercontent.com/116917595/213289838-b05d838d-745c-4d64-a874-ec31bd62ef99.png">
The addresses are stored in wtx->address separated by , , so split the string and call lookupAddress for each one.