[bisq-network/bisq] Display 2 decimal places for fiat trading fees (#3973)

[Miles Petrov]

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Fixes #3972 

Fixes an issue where fiat trading fees were being rounded to the nearest whole dollar.

Tests pass, as did my visual sanity checks: 

![3972-0](https://user-images.githubusercontent.com/60350680/74595964-758e8b00-5016-11ea-849d-a8ba658d52dc.png)
![3972-1](https://user-images.githubusercontent.com/60350680/74595965-76272180-5016-11ea-864d-f029240eb3e7.png)

You can view, comment on, or merge this pull request online at:

  https://github.com/bisq-network/bisq/pull/3973

-- Commit Summary --

  * Display 2 decimal places for fiat trading fees

-- File Changes --

    M desktop/src/main/java/bisq/desktop/util/DisplayUtils.java (2)

-- Patch Links --

https://github.com/bisq-network/bisq/pull/3973.patch
https://github.com/bisq-network/bisq/pull/3973.diff

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