[bisq-network/bisq] Trasaction broadcast bug (#4538)

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### Description

After taking an offer and funding my Bisq wallet, neither the `Multisig deposit` nor the `Taker and tx fee` transactions are broadcast to the blockchain making it impossible for the trade to progress. To claw back the funds, I have to Resync the SPV chain, at which point Bisq recognizes that the deposit Tx is missing and allows me to move the trade to failed trades.

#### Version

v1.3.7

### Steps to reproduce

Explained above

### Expected behaviour

Both  `Multisig deposit` and `Taker and tx fee` should be broadcast.

### Actual behaviour

Neither txs are broadcast.

### Screenshots


#### Device or machine

Running in a modified version of https://github.com/leshik/bisq-docker (so via Docker).

#### Additional info

I think this is related to https://github.com/bisq-network/bisq/pull/4521#issuecomment-691882779. At the time when the Txs are broadcast, I see the following error log:
```
} TxBroadcastException{
     txId='null'
} bisq.core.btc.exceptions.TxBroadcastTimeoutException: The transaction was not broadcasted in 5 seconds. txId=...
```

I'm not familiar with the Bisq codebase, but if there is a known viable solution to this problem, I'd be happy to help implement it as Bisq is currently unusable for me because of this issue.

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https://github.com/bisq-network/bisq/issues/4538
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