[bisq-network/bisq] Make prompt text readable in dark mode (#4092)

[wiz]

wiz requested changes on this pull request.

Actually just noticed this
```
Mar 24, 2020 7:04:48 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Caught 'java.lang.ClassCastException: java.base/java.lang.String cannot be cast to javafx.graphics at 10.0.1/javafx.scene.paint.Color' while converting value for '-fx-prompt-text-fill' from rule '*.text-field' in stylesheet jar:file:/Applications/Bisq.app/Contents/Java/Bisq-1.2.9.jar!/bisq/desktop/bisq.css
Mar 24, 2020 7:04:48 PM javafx.scene.CssStyleHelper calculateValue
WARNING: Caught 'java.lang.ClassCastException: java.base/java.lang.String cannot be cast to javafx.graphics at 10.0.1/javafx.scene.paint.Color' while converting value for '-fx-prompt-text-fill' from rule '*.text-field' in stylesheet jar:file:/Applications/Bisq.app/Contents/Java/Bisq-1.2.9.jar!/bisq/desktop/bisq.css
```



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