[bisq-network/bisq] Tidy PersistableEnvelope inheritance (#4102)

[Christoph Atteneder]

Just tested a couple of cycles on Regtest.
The only thing I recognized was, that although the consensus hashes were fine, the voting results were only shown for one party. After a restart the results were shown correctly to the other party as well. 

**Before restart**
<img width="1312" alt="Bildschirmfoto 2020-04-27 um 15 50 26" src="https://user-images.githubusercontent.com/170962/80379996-30e96080-889f-11ea-97ab-cafe78d7b360.png">
**After restart**
<img width="1312" alt="Bildschirmfoto 2020-04-27 um 15 51 25" src="https://user-images.githubusercontent.com/170962/80380008-35157e00-889f-11ea-8c3b-df06215beb60.png">

@stejbac Do you think this can be caused by this changes? Could be an existing bug, that I just never recognized during testing.

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