[bisq-network/bisq] Focus color of buttons should be more saturated/darker (Issue #2134) (#2187)

[CaveSpectre11]

Hover (right side is hovered):
![screenshot from 2018-12-31 12-40-10](https://user-images.githubusercontent.com/36988814/50565106-62790880-0cf9-11e9-847d-70a332c1c6f1.png)

![screenshot from 2018-12-31 12-40-45](https://user-images.githubusercontent.com/36988814/50565109-791f5f80-0cf9-11e9-8d6c-d6c348758a59.png)

Focused (right side is focused)
![screenshot from 2018-12-31 12-45-06](https://user-images.githubusercontent.com/36988814/50565163-fea30f80-0cf9-11e9-9607-c382a4a1883c.png)

![screenshot from 2018-12-31 12-44-28](https://user-images.githubusercontent.com/36988814/50565164-0498f080-0cfa-11e9-96b8-46f6b98255c0.png)


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