[bisq-network/bisq] Missing dark mode styling of popover trade period warning box (#3957)

[Steven Barclay]

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### Description

In dark mode, the _"If the period is exceeded..."_ warning box of the info popover in the trade step view appears to have the wrong styling. It looks like it should be dark yellow/pink rather than the same light yellow/pink for both modes. This also makes the warning text hard to read in dark mode.

#### Version

Latest snapshot of master.

### Steps to reproduce

Select dark mode, start a trade and check the info popover

### Expected behaviour

Different background colour in dark mode (say, dark yellow), to match the rest of the popover.

### Actual behaviour

Same warning message background colour (light yellow/pink) in light and dark mode.

### Screenshots

![Warning Box Styling](https://user-images.githubusercontent.com/54855381/74135657-9a34ce00-4be4-11ea-95dc-35b405ceafc1.png)


#### Device or machine

Linux



#### Additional info

N/A


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https://github.com/bisq-network/bisq/issues/3957
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