[bisq-network/bisq] BSQ trading fee in fiat not calculated properly (#4865)

[MwithM]

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### Description

When placing or taking an offer, BSQ paid in EUR displayed is overestimated. It should use the [30 day average](https://github.com/bisq-network/bisq/pull/4781) but seems like something is failing.



#### Version

v1.5

### Steps to reproduce

Try taking or making an offer.

### Expected behaviour

Use 30 day average to give a value approximate to half of BTC trading fee in fiat.

### Actual behaviour

It gives a EUR value 5 times higher than paying in BTC.

### Screenshots

![imagen](https://user-images.githubusercontent.com/50149324/100525314-04dce780-31c0-11eb-892d-e4b541dd3439.png)

### Additional info

I checked 30 day average and it's normal (5122 sats/BSQ, 0.86 USD/BSQ) so that is not missing. Maybe it still taking the info from only the last trade?

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https://github.com/bisq-network/bisq/issues/4865
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