[bisq-network/bisq] Dark mode not disabled on 1st attempt to turn it off after restart (#3447)

[Stan]

[How to Reproduce]
1. Start arbitration desktop on Ubuntu 18
2. Enable dark mode
3. Shut down desktop
4. Restart arbitration desktop
5. Disable dark mode 

[Expected Results]
Dark mode is disabled on 1st attempt to turn it off.

[Actual Results]
Dark mode is not disabled on 1st attempt to turn it off (see bottom left of screen shot below).
It is disabled on 2nd attempt to turn it off.
![DarkModeNotDisabled](https://user-images.githubusercontent.com/36207203/67396315-b8b38280-f57d-11e9-9c48-2beab02c13d3.png)

This issue was discovered during v1.2.0 [testing](https://bisq.ontestpad.com/script/103#/1) .


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https://github.com/bisq-network/bisq/issues/3447
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