Insufficient balance
Hey

I'm not sure if I'm missing something in the docs or have found a bug but I'm getting this:

```
[2022-04-12 21:39:42.4730] [I] [PayoutManager] Processing payments for pool dgb-sha256-1
[2022-04-12 21:39:42.4730] [I] [PayoutManager] No updated blocks for pool dgb-sha256-1
[2022-04-12 21:39:42.4756] [I] [dgb-sha256-1] [Bitcoin Payout Handler] Paying 459.62012 DGB to 2 addresses
[2022-04-12 21:39:42.4756] [E] [dgb-sha256-1] [Bitcoin Payout Handler] sendmany returned error: Account has insufficient funds code -6
```

The wallet has plenty of balance according to the local digi node and I even sent a few to it to enable these to go.

I'd appreciate ideas.

Other than this little issue Miningcore is awesome and going to be the perfect choice for my project I think.

Thanks!
Simon