Fix: update balance table

[austinabell]

Summary of changes
Changes introduced in this pull request:

• Balance table had changed in actors, but wasn't noticed because the only difference was that items in the table are now removed when the balance goes back to 0 (somewhat strange as it would incur a large gas cost if not encountered in a cron, but I guess this is just to avoid state bloat)

With #847, syncs past 3388 (still syncing atm)

Reference issue to close (if applicable)

Closes

Other information and links