[bisq-network/bisq] Fix shutdown persistence issue in Seednode (#5388)

[Stephan Oeste]

testedACK
Works on my seednodes
```
Apr-03 16:57:35.996 [SeedNodeMain] WARN  b.n.p.n.TorNetworkNode: We got called shutDown again and ignore it. 
Apr-03 16:57:35.998 [SeedNodeMain] INFO  b.n.p.n.NetworkNode: Shutdown 16 connections 
Apr-03 16:57:36.044 [SeedNodeMain] INFO  b.c.p.PersistenceManager: Start flushAllDataToDisk 
...
Apr-03 16:57:36.084 [SeedNodeMain] INFO  b.n.p.n.NetworkNode: Shutdown completed with all connections closed 
Apr-03 16:57:36.086 [SeedNodeMain] WARN  b.c.p.PersistenceManager: We got flushAllDataToDisk called again. This can happen in some
 rare cases. We ignore the repeated call. 
Apr-03 16:57:36.090 [SeedNodeMain] INFO  b.c.p.PersistenceManager: flushAllDataToDisk completed 

```

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