[bisq-network/bisq] Fix bsq to fiat calculation (#4909)

[chimp1984]

As there was a recent BSQ trade with quite a higher price than the 30 days average one can see the difference from the release version to that PR version in the screenshots below.

<img width="2384" alt="Screen Shot 2020-12-07 at 13 56 37" src="https://user-images.githubusercontent.com/54558767/101392712-12673100-3894-11eb-9446-a2b8470e234b.png">
<img width="2292" alt="Screen Shot 2020-12-07 at 13 56 25" src="https://user-images.githubusercontent.com/54558767/101392716-1430f480-3894-11eb-93cd-38158503f37a.png">


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