[bisq-network/bisq] Could not decrypt bytes (#4832)

[polaris1205]

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### Description

<!-- brief description of the bug -->
Cannot get my private keys when I go to ctrl+j, and check the box "include private keys"
#### Version

<!-- commit id or version number -->
1.4.2
### Steps to reproduce

<!--if you can reliably reproduce the bug, list the steps here  -->
ctrl+j, and check the box "include private keys"
### Expected behaviour

<!--description of the expected behavior -->
Private keys would be shown.
### Actual behaviour

<!-- explain what happened instead of the expected behaviour -->
Error message pops up (see screenshot)
### Screenshots

<!--Screenshots if gui related, drag and drop to add to the issue -->
![Capture](https://user-images.githubusercontent.com/66457627/99863754-9ec3e500-2b6d-11eb-80fa-f18c35e449cc.JPG)

#### Device or machine

<!-- device/machine used, operating system -->
HP-Envy-15 2040nr (2012)
Windows 7

#### Additional info

<!-- Additional information useful for debugging (e.g. logs) -->
[bisq.log](https://github.com/bisq-network/bisq/files/5576803/bisq.log)


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https://github.com/bisq-network/bisq/issues/4832
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