[bug] Unable to recover accounts with a balance of less than 100k

@guggero is already working on this.

Since Aug 19, 2021.

I recently attempted to recover my pool account after having removed the Lightning Terminal app in Umbrel as part of troubleshooting connectivity. Upon running he accounts recover process it seemingly worked, but my account is now stuck in "PENDING_OPEN"

```
umbrel@hoz-umbrel:~$ sudo docker exec -it 412f /bin/bash
bash-5.1$ pool --tlscertpath=/data/.lit/tls.cert --rpcserver=localhost:8443 --macaroonpath=/data/.pool/mainnet/pool.macaroon accounts recover
{
"num_recovered_accounts": 0
}
bash-5.1$ pool --tlscertpath=/data/.lit/tls.cert --rpcserver=localhost:8443 --macaroonpath=/data/.pool/mainnet/pool.macaroon accounts list
{
"accounts": [
{
"trader_key": "03802dacb679b5055fb9cc057bc26fd906a2cb9a62daf3aaa84cb848b13888f1d0",
"outpoint": "bc3b0115804c64ca7d01c6968a309f27ab49c698b293b8da81d71ae5a3b6985e:0",
"value": 7483,
"available_balance": 7483,
"expiration_height": 705794,
"state": "PENDING_OPEN",
"latest_txid": "bc3b0115804c64ca7d01c6968a309f27ab49c698b293b8da81d71ae5a3b6985e"
}
]
}
```

Further troubleshooting of container in Umbrel showed the below log entry:

`unable to resume account 03802dacb679b5055fb9cc057bc26fd906a2cb9a62daf3aaa84cb848b13888f1d0: rpc error: code = Unknown desc = minimum account value allowed is 0.001 BTC`

refer to https://lightningcommunity.slack.com/archives/C01E0PRQ960/p1629110370057200 for more context