[bisq-network/bisq] Fix style issues (#3876)

[Christoph Atteneder]

Added another fix for the small label icon in dark mode

**Before**
![Bildschirmfoto 2020-01-08 um 17 37 29](https://user-images.githubusercontent.com/170962/71998989-dfaa5800-3240-11ea-9bf3-fd468370139c.png)
**After**
![Bildschirmfoto 2020-01-08 um 17 59 11](https://user-images.githubusercontent.com/170962/71998988-df11c180-3240-11ea-810f-518e45536708.png)

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