[bisq-network/bisq] Open Trades View contains duplicates (#5088)

[Alex]

### Description

Sometimes a the list of trades in the trade view contains duplicates in row n+2 and n+3 (where n is the number of open trades).

#### Version

1.5.4

### Steps to reproduce

Confirm a payment with the "open trades" view open. 

### Expected behaviour

The confirmed trade should be gone from the "open trades" view.

### Actual behaviour

The "open trades" list gets corrupted and shows the confirmed trade at position n+2 as duplicate of n, followed by another trade at n+3 as duplicate of n-1 (see screenshot). 

### Screenshots
![bisq-open-trades-view](https://user-images.githubusercontent.com/1662172/104916171-fb872480-5991-11eb-8a17-bee560f97871.png)


#### Device or machine

OS Name	Microsoft Windows 10 Pro
Version	10.0.18363 Build 18363
System Type	x64-based PC

#### Additional info



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https://github.com/bisq-network/bisq/issues/5088
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