[bisq-network/bisq] Reduce number of decimals shown for monetary fiat prices to 2 (#3926)

[Miles Petrov]

Thanks @ripcurlx for the review, I've pushed an update so decimals are removed for displayed fiat volume amounts.

I've updated the appropriate tests and ran the `bisq:desktop test` task. I also did sanity checks with a local build. Let me know if I missed something.

![3926-0](https://user-images.githubusercontent.com/60350680/73777406-59a60200-4757-11ea-9a0a-f585ae341401.png)
![3926-1](https://user-images.githubusercontent.com/60350680/73777408-59a60200-4757-11ea-8fad-23dcfbf51d1c.png)
![3926-2](https://user-images.githubusercontent.com/60350680/73777409-59a60200-4757-11ea-858e-ff79eeb45b55.png)
![3926-3](https://user-images.githubusercontent.com/60350680/73777411-5a3e9880-4757-11ea-9b24-775191a48028.png)


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