[bisq-network/bisq] Remove outliers when calculating BSQ rate (#4706)

[Stan]

I tried your PR's branch again, this time downgrading from JDK 12 to JDK 11, and there was no NPE.  I got the same results in the master branch.    Clicking the DAO menu item in:

```
Chimp's PR branch
JDK 11	12
    OK  JFOENIX NPE
```

```
Master Branch
JDK 11	12
    OK  JFOENIX NPE
```

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