[bisq-network/bisq] Various CSS fixes for v1.1.6 (#3168)

[wiz]

@freimair This PR doesn't relate to that, but can you confirm #1263 is still reproducible on master? I tested macos both light/dark OS setting and after restarting Bisq it loads the correct visible menu tray icon.
<img width="33" alt="Screen Shot 2019-09-01 at 23 23 21" src="https://user-images.githubusercontent.com/232186/64077881-9042a100-cd0f-11e9-9df0-9e0d59be1777.png">

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